diff --git a/src/components/addTime/calendar/index.tsx b/src/components/addTime/calendar/index.tsx
index a9ad8a3..ed3900d 100644
--- a/src/components/addTime/calendar/index.tsx
+++ b/src/components/addTime/calendar/index.tsx
@@ -32,8 +32,12 @@ const Calendar = ({
 
   const [date, setDate] = useState<Date>(new Date());
 
+  // date: 현재 캘린더에 보이는 날짜들 (react-calendar)
+  // return: class name (string)
   const addTileClassName = ({ date }: { date: Date }) => {
+    // 일정 등록이 가능한 날짜인 경우
     if (dates.indexOf(dayjs(date).format('YYYY-MM-DD')) !== -1) {
+      // 선택된 날짜인 경우
       if (selected.indexOf(dayjs(date).format('YYYY-MM-DD 00:00')) !== -1) {
         return `selected valid availableDate${dayjs(date).format(
           'YYYY-MM-DD'
@@ -47,17 +51,12 @@ const Calendar = ({
   };
 
   useEffect(() => {
-    const index = selected.indexOf(`${dayjs(date).format('YYYY-MM-DD')} 00:00`);
-
     const element = document.querySelector(
       `.availableDate${dayjs(date).format('YYYY-MM-DD')}`
     ) as HTMLElement;
 
     if (element) {
-      if (index === -1) {
-        element.classList.add('selected');
-        setSelected([...selected, `${dayjs(date).format('YYYY-MM-DD')} 00:00`]);
-      } else {
+      if (selected.includes(`${dayjs(date).format('YYYY-MM-DD')} 00:00`)) {
         element.classList.remove('selected');
         setSelected(
           selected.filter(
@@ -65,6 +64,9 @@ const Calendar = ({
               availableDate !== `${dayjs(date).format('YYYY-MM-DD')} 00:00`
           )
         );
+      } else {
+        element.classList.add('selected');
+        setSelected([...selected, `${dayjs(date).format('YYYY-MM-DD')} 00:00`]);
       }
     }
   }, [date]);
diff --git a/src/components/addTime/table/index.tsx b/src/components/addTime/table/index.tsx
index 0b6d8a1..228e026 100644
--- a/src/components/addTime/table/index.tsx
+++ b/src/components/addTime/table/index.tsx
@@ -17,6 +17,11 @@ import {
 } from './index.styles';
 import { TableType } from '../tableArea/index.types';
 
+interface ValidDateType {
+  date: string;
+  isValidDate: boolean;
+}
+
 const Table = ({
   contentRef,
   selected,
@@ -28,12 +33,12 @@ const Table = ({
   isResetButtonClick,
   setIsResetButtonClick,
 }: TableType) => {
-  const timeDetail = getTimeArray(times);
-
   const selectoRef = useRef<any>(null);
+  const timeDetail = getTimeArray(times);
 
   useEffect(() => {
     if (selected[tablePage]) {
+      // 등록했던 일정을 수정할 경우 className 제거하는 과정 필요
       const selectedElements = document.querySelectorAll('.selected');
       selectedElements.forEach((element) => {
         element.classList.remove('selected');
@@ -44,40 +49,48 @@ const Table = ({
         element?.classList.add('selected');
       });
 
+      // 페이지 진입 시 이전에 선택했던 칸에 선택 표시
       selectoRef.current.setSelectedTargets(
         selected[tablePage].map((id) => document.getElementById(id))
       );
     }
   }, [tablePage, selected]);
 
+  // 시간 선택 방법을 토글하면 선택한 항목 초기화
   useEffect(() => {
     selectoRef.current.setSelectedTargets([]);
     setIsResetButtonClick(false);
   }, [selectedMethod, isResetButtonClick]);
 
+  // Selecto 컴포넌트에 전달할 onSelect 핸들러
   const handleCellSelect = (e: any) => {
     if (e.inputEvent.type !== 'touchstart') {
-      e.added.forEach((el: any) => {
+      e.added.forEach((el: HTMLElement) => {
         el.classList.add('selected');
       });
 
-      e.removed.forEach((el: any) => {
+      e.removed.forEach((el: HTMLElement) => {
         el.classList.remove('selected');
       });
     }
   };
 
   const addSelectedToObject = () => {
+    // 현재 table page에서 선택된 시간
     const newArr: string[] = Array.from(
       document.querySelectorAll('.selected')
     ).map((node: Element) => node.id);
 
+    // key: table page
+    // value: 각 table page에서 선택된 시간 배열
     const newObj = { ...selected };
+
     newObj[tablePage] = newArr;
 
     setSelected(newObj);
   };
 
+  // 한 칸씩 클릭해서 선택할 경우
   const handleClickOneElement = (
     e: React.MouseEvent<HTMLDivElement> | React.TouchEvent<HTMLDivElement>
   ) => {
@@ -102,7 +115,7 @@ const Table = ({
         <Blank />
         <DateWrapper>
           {validDateChunks[tablePage].map(
-            ({ date, isValidDate }: { date: string; isValidDate: boolean }) =>
+            ({ date, isValidDate }: ValidDateType) =>
               date.slice(0, 5) === 'blank' ? (
                 <Date key={date} isValidDate={isValidDate} />
               ) : (
@@ -122,7 +135,7 @@ const Table = ({
         </TimeWrapper>
 
         {validDateChunks[tablePage]?.map(
-          ({ date, isValidDate }: { date: string; isValidDate: boolean }) => (
+          ({ date, isValidDate }: ValidDateType) => (
             <SelectWrapper key={date} className="container">
               <Selecto
                 className="mpr-designer-selection"
diff --git a/src/components/addTime/tableArea/index.tsx b/src/components/addTime/tableArea/index.tsx
index 384b96d..5a21db4 100644
--- a/src/components/addTime/tableArea/index.tsx
+++ b/src/components/addTime/tableArea/index.tsx
@@ -72,14 +72,14 @@ const TableArea = ({
     if (data) {
       const newObj: TableSelectedTypes = {};
 
-      data.availableDateTimes.forEach((time: string) => {
-        validDateChunks.map((chunk, index) => {
-          chunk.map((date) => {
-            if (date.date.slice(0, 10) === time.slice(0, 10)) {
-              if (newObj[index] === undefined) {
-                newObj[index] = [time];
+      data.availableDateTimes.forEach((date: string) => {
+        validDateChunks.map((chunk, tablePage) => {
+          chunk.map((item) => {
+            if (item.date.slice(0, 10) === date.slice(0, 10)) {
+              if (newObj[tablePage]) {
+                newObj[tablePage].push(date);
               } else {
-                newObj[index].push(time);
+                newObj[tablePage] = [date];
               }
             }
           });
diff --git a/src/components/addTime/tooltip/index.tsx b/src/components/addTime/tooltip/index.tsx
index 33fd876..e22682d 100644
--- a/src/components/addTime/tooltip/index.tsx
+++ b/src/components/addTime/tooltip/index.tsx
@@ -8,9 +8,14 @@ import {
 import guideIcon from '@/assets/icons/guide.png';
 import guideHandle from '@/assets/icons/guideHandle.png';
 import closeIcon from '@/assets/icons/close.png';
-import { useCallback } from 'react';
+import { Dispatch, SetStateAction, useCallback } from 'react';
 
-const Tooltip = ({ isTooltipShown, setIsTooltipShown }: any) => {
+interface Props {
+  isTooltipShown: boolean;
+  setIsTooltipShown: Dispatch<SetStateAction<boolean>>;
+}
+
+const Tooltip = ({ isTooltipShown, setIsTooltipShown }: Props) => {
   const handleGuideCloseClick = useCallback(() => {
     localStorage.setItem('isTooltipShown', JSON.stringify(false));
     setIsTooltipShown(false);
diff --git a/src/components/createRoom/calendar/index.tsx b/src/components/createRoom/calendar/index.tsx
index 2887811..1932160 100644
--- a/src/components/createRoom/calendar/index.tsx
+++ b/src/components/createRoom/calendar/index.tsx
@@ -1,4 +1,10 @@
-import { useCallback, useEffect, useState } from 'react';
+import {
+  Dispatch,
+  SetStateAction,
+  useCallback,
+  useEffect,
+  useState,
+} from 'react';
 import { DateObject, getAllDatesInRange } from 'react-multi-date-picker';
 import {
   CalendarComponent,
@@ -9,8 +15,8 @@ import Toggle from '../toggle';
 
 interface Calendar {
   dates: string[];
-  setDates: React.Dispatch<React.SetStateAction<string[]>>;
-  setMonth: React.Dispatch<React.SetStateAction<string>>;
+  setDates: Dispatch<SetStateAction<string[]>>;
+  setMonth: Dispatch<SetStateAction<string>>;
 }
 
 const Calendar = ({ dates, setDates, setMonth }: Calendar) => {
diff --git a/src/components/current/shareLinkBottomSheet/index.tsx b/src/components/current/shareLinkBottomSheet/index.tsx
index 1e24a6f..1ec8ed7 100644
--- a/src/components/current/shareLinkBottomSheet/index.tsx
+++ b/src/components/current/shareLinkBottomSheet/index.tsx
@@ -1,5 +1,5 @@
 import { useEffect } from 'react';
-import { useRecoilState } from 'recoil';
+import { useSetRecoilState } from 'recoil';
 import { LinkShareBottomSheetState } from '@/atoms/LinkShareBottomSheetAtom';
 
 import {
@@ -23,7 +23,7 @@ const ShareLinkBottomSheet = () => {
   const { inviteURL, handleUseShareAPI, handleCopyToClipBoard } =
     useShareLink();
 
-  const [, setIsLinkShareBottomSheetOpened] = useRecoilState(
+  const setIsLinkShareBottomSheetOpened = useSetRecoilState(
     LinkShareBottomSheetState
   );
 
diff --git a/src/components/current/table/index.tsx b/src/components/current/table/index.tsx
index 17fa2e9..af9fef4 100644
--- a/src/components/current/table/index.tsx
+++ b/src/components/current/table/index.tsx
@@ -1,4 +1,3 @@
-import { useEffect, useState } from 'react';
 import { useParams } from 'react-router-dom';
 
 import {
@@ -14,8 +13,6 @@ import {
   Wrapper,
 } from './index.styles';
 
-import { AvailableDateTimeTypes } from '@/types/current';
-
 import { getTimeRange } from '@/utils/getTimeRange';
 import { getTableDateFormat } from '@/utils/getTableDateFormat';
 import { getCurrentTableInfo } from '@/utils/getCurrentTableInfo';
@@ -32,20 +29,8 @@ const Table = ({ dates, startTime, endTime, participants }: TableTypes) => {
   const { roomUUID } = useParams() as { roomUUID: string };
   const timeRange = getTimeRange(parseInt(startTime), parseInt(endTime));
 
-  const [currentTableInfo, setCurrentTableInfo] = useState<
-    AvailableDateTimeTypes[]
-  >([]);
-
   const { data } = useGetAvailableTimesByGroup(roomUUID);
 
-  useEffect(() => {
-    if (data) {
-      setCurrentTableInfo(
-        getCurrentTableInfo(data.availableDateTimes, timeRange)
-      );
-    }
-  }, [data]);
-
   return (
     <Wrapper>
       <Top>
@@ -70,19 +55,22 @@ const Table = ({ dates, startTime, endTime, participants }: TableTypes) => {
           ))}
         </TimeWrapper>
 
-        {currentTableInfo.map(({ availableDate, availableTimeInfos }: any) => (
-          <SelectWrapper key={availableDate}>
-            {availableTimeInfos.map(
-              ({ time, count }: { time: number; count: number }) => (
-                <Select
-                  key={`${availableDate} ${time}`}
-                  count={count}
-                  total={participants.length}
-                />
-              )
-            )}
-          </SelectWrapper>
-        ))}
+        {data &&
+          getCurrentTableInfo(data.availableDateTimes, timeRange).map(
+            ({ availableDate, availableTimeInfos }: any) => (
+              <SelectWrapper key={availableDate}>
+                {availableTimeInfos.map(
+                  ({ time, count }: { time: number; count: number }) => (
+                    <Select
+                      key={`${availableDate} ${time}`}
+                      count={count}
+                      total={participants.length}
+                    />
+                  )
+                )}
+              </SelectWrapper>
+            )
+          )}
       </Bottom>
     </Wrapper>
   );
diff --git a/src/hooks/useScroll.ts b/src/hooks/useScroll.ts
index b820de8..2d8804b 100644
--- a/src/hooks/useScroll.ts
+++ b/src/hooks/useScroll.ts
@@ -20,15 +20,18 @@ export const useScroll = () => {
 
     const onMouseMove = (e: MouseEvent) => {
       const newTop = e.clientY - shiftY - track.getBoundingClientRect().top;
-      const bottomEdge = track.offsetHeight - thumb.offsetHeight;
 
-      const updatedOffsetY = Math.min(Math.max(0, newTop), bottomEdge);
+      // track에서 thumb의 위치
+      // 0일 경우 thumb는 track의 최상단에 위치
+      const diff = track.offsetHeight - thumb.offsetHeight;
+
+      const updatedOffsetY = Math.min(Math.max(0, newTop), diff);
       setOffsetY(updatedOffsetY);
     };
 
     const onMouseUp = () => {
-      document.removeEventListener('mouseup', onMouseUp);
       document.removeEventListener('mousemove', onMouseMove);
+      document.removeEventListener('mouseup', onMouseUp);
     };
 
     document.addEventListener('mousemove', onMouseMove);
@@ -46,15 +49,15 @@ export const useScroll = () => {
     const onTouchMove = (e: TouchEvent) => {
       const newTop =
         e.touches[0].clientY - shiftY - track.getBoundingClientRect().top;
-      const bottomEdge = track.offsetHeight - thumb.offsetHeight;
+      const diff = track.offsetHeight - thumb.offsetHeight;
 
-      const updatedOffsetY = Math.min(Math.max(0, newTop), bottomEdge);
+      const updatedOffsetY = Math.min(Math.max(0, newTop), diff);
       setOffsetY(updatedOffsetY);
     };
 
     const onTouchEnd = () => {
-      document.removeEventListener('touchend', onTouchEnd);
       document.removeEventListener('touchmove', onTouchMove);
+      document.removeEventListener('touchend', onTouchEnd);
     };
 
     document.addEventListener('touchmove', onTouchMove);
diff --git a/src/pages/addTime/index.tsx b/src/pages/addTime/index.tsx
index 4f44ac0..d66ca95 100644
--- a/src/pages/addTime/index.tsx
+++ b/src/pages/addTime/index.tsx
@@ -1,4 +1,4 @@
-import { useEffect, useRef, useState } from 'react';
+import { useRef, useState } from 'react';
 import { useParams } from 'react-router-dom';
 import { useRecoilState } from 'recoil';
 
@@ -11,10 +11,8 @@ import AddToggle from '@/components/addTime/toggle';
 import AddTimeTable from '@/components/addTime/tableArea';
 import AddCalendar from '@/components/addTime/calendar';
 import { Body, Main, Title, TitleWrapper, Wrapper } from './index.styles';
-import { initialRoomInfoData } from '@/assets/data/initialRoomInfoData';
 
 import { TableSelectedTypes } from './index.types';
-import { RoomTypes } from '@/types/roomInfo';
 
 import { useGetRoomInfo } from '@/queries/room/useGetRoomInfo';
 import { ROUTES } from '@/constants/ROUTES';
@@ -34,15 +32,9 @@ const AddTime = () => {
   const [isTooltipShown, setIsTooltipShown] =
     useRecoilState<boolean>(tooltipState);
 
-  const { data } = useGetRoomInfo(roomUUID);
-  const [{ title, dates, startTime, endTime }, setRoomInfo] =
-    useState<RoomTypes>(initialRoomInfoData);
-
-  useEffect(() => {
-    if (data) {
-      setRoomInfo(data);
-    }
-  }, [data]);
+  const {
+    data: { title, dates, startTime, endTime },
+  } = useGetRoomInfo(roomUUID);
 
   const isTableView = startTime !== null && endTime !== null ? true : false;
 
@@ -63,7 +55,7 @@ const AddTime = () => {
           <Title>시간으로 선택해 주세요</Title>
         </TitleWrapper>
         <Main>
-          {startTime !== null && endTime !== null ? (
+          {isTableView ? (
             <AddTimeTable
               wrapperRef={wrapperRef}
               startTime={parseInt(startTime)}
diff --git a/src/utils/getAddTimeTableInfo.ts b/src/utils/getAddTimeTableInfo.ts
index 60b638d..fc92b7c 100644
--- a/src/utils/getAddTimeTableInfo.ts
+++ b/src/utils/getAddTimeTableInfo.ts
@@ -23,18 +23,16 @@ export const getAddTimeTableInfo = (dates: string[]) => {
     newDates = [...newDates, `blank${i}`];
   }
 
-  const validDates: ValidDate[][] = [
-    newDates.map((date: string) =>
-      date.slice(0, 5) === 'blank'
-        ? { date: date, isValidDate: false }
-        : { date: date, isValidDate: true }
-    ),
-  ];
+  const validDates: ValidDate[] = newDates.map((date: string) =>
+    date.slice(0, 5) === 'blank'
+      ? { date: date, isValidDate: false }
+      : { date: date, isValidDate: true }
+  );
 
   let dateChunks: Array<ValidDate[]> = [];
 
-  for (let i = 0; i < validDates[0].length; i += 3) {
-    dateChunks = [...dateChunks, validDates[0].slice(i, i + 3)];
+  for (let i = 0; i < validDates.length; i += 3) {
+    dateChunks = [...dateChunks, validDates.slice(i, i + 3)];
   }
 
   return dateChunks;
diff --git a/src/utils/getCountdown.ts b/src/utils/getCountdown.ts
index 2fe709b..9d80289 100644
--- a/src/utils/getCountdown.ts
+++ b/src/utils/getCountdown.ts
@@ -1,26 +1,14 @@
 import dayjs from 'dayjs';
 import { useEffect, useState } from 'react';
 
-export const getCountdown = (targetDate: string) => {
-  const deadLine = dayjs(targetDate).format('YYYY-MM-DD HH:mm:00:00');
-
-  const [countDown, setCountDown] = useState(dayjs(deadLine).diff(dayjs()));
-
-  useEffect(() => {
-    setInterval(() => {
-      setCountDown(dayjs(deadLine).diff(dayjs()));
-    }, 10);
-  }, [deadLine]);
-
-  return getReturnValues(countDown);
-};
-
+// 한 자리수 숫자인 경우 앞에 0 추가
 const addZero = (num: number) => {
   if (num.toString().length === 1) {
     return '0' + num.toString();
   } else return num;
 };
 
+// countDown: 마감 시간까지 남은 시간
 const getReturnValues = (countDown: number) => {
   const days = Math.floor(countDown / (1000 * 60 * 60 * 24));
   const hours = Math.floor(
@@ -38,3 +26,17 @@ const getReturnValues = (countDown: number) => {
     milliseconds: addZero(milliseconds),
   };
 };
+
+export const getCountdown = (targetDate: string) => {
+  const deadLine = dayjs(targetDate).format('YYYY-MM-DD HH:mm:00:00');
+
+  const [countDown, setCountDown] = useState(dayjs(deadLine).diff(dayjs()));
+
+  useEffect(() => {
+    setInterval(() => {
+      setCountDown(dayjs(deadLine).diff(dayjs()));
+    }, 10);
+  }, [deadLine]);
+
+  return getReturnValues(countDown);
+};
diff --git a/src/utils/getCurrentTableInfo.ts b/src/utils/getCurrentTableInfo.ts
index b202001..10ef132 100644
--- a/src/utils/getCurrentTableInfo.ts
+++ b/src/utils/getCurrentTableInfo.ts
@@ -16,6 +16,7 @@ export const getCurrentTableInfo = (
     })
   );
 
+  // 최소 column 개수: 4
   if (availableDateTimes.length < 4) {
     const remainder = 4 - (availableDateTimes.length % 4);
     const timeArray = getTimeArray(timeRange);