Oh no... my ex-boyfriend lives next door?! Excited to start a new chapter in her life as an adult, Hye-Jin gets caught off guard when she finds out that her first love Hae-Jun -- whom she dumped five years ago -- is her new next door neighbor and fellow classmate at the same university! Still dazed and confused about love and dating, will Hye-Jin learn how to navigate her relationships with certainty and confidence and not get sidetracked by what others think?

(Source: WEBTOONS, edited)