Mi Young (Song Eun-jin) returns home unexpectedly after studying in the U.S., missing her first love. Back home, she finds her sister Mi Hye and her beloved boyfriend Jae Hyuk (Jeong-hyeong) dating. For the first time, Mi Young feels jealousy and hatred toward her sister.

Learning of Mi Young’s feelings, Mi Hye asks Jae Hyuk to break up and avoid Mi Young to resolve the messy love triangle. Yet, despite respecting her sister’s choice, Mi Hye can’t erase her feelings for Jae Hyuk.

Months later, Mi Young and Jae Hyuk meet by chance at a funeral. Mi Young’s love for him reignites, and she confesses the insincere emotions she’s endured. Meanwhile, Mi Hye explores new love with Young-hoon (Kim Do-jin), a divorced man, cautiously starting a new relationship.