Chaewon and Minju have been together for almost 7 years and are about to get married. Everything is perfect or is it? It takes a single lie to ruin everything they've built together. 

Minju loves Chaewon the first time she saw her. She confesses through a letter but gets rejected by her. When her home is destroyed by an asteroid, Minju and her father are invited to live in the same house as Chaewon. She takes this chance to win over Chaewon's heart.