After being joyfully reunited with Jinhan Ryu, the best friend of her brother, Hayeon Ji’s day immediately takes a turn for the worse as the two witness her boyfriend with another woman, right in front of them. After a series of awkward, coincidental encounters between the two, Hayeon and Jinhan begin to get reacquainted with one another. But after spending some time together, Jinhan seems to begin seeing her as more than his friend’s little sister.