College student Lee Won-jun moves into a sharehouse, and meets a beautiful yet strangely familiar housemate — but they get off on the wrong foot.

Gradually, Lee Doona gets acquainted with Won-jun’s social circle. He later celebrates Doona's birthday, attempting to get to know her better.

Doona secretly visits Dream Sweet’s showcase event. Later, she invites Won-jun on a spontaneous trip to her childhood home.

After the return of a person from her past, Doona makes a rash decision. Won-jun later confronts Doona in a moment of pain and frustration.

As Won-jun and Doona's relationship flourishes, a chance at a comeback comes knocking on Doona's door — but so do the tough choices.