Irene's first kiss is cursed. Whoever her first is, she'll have to kiss that person at least once every day or she'll die.

In which Irene transfers into a new school and is immediately greeted by a pair of troublemaking siblings—Wendy and Mark.

Sooyoung has a mood ring. 

Wendy tends to ask Irene random questions. Sometimes about useless things, sometimes about serious ones. But Irene didn't pay too much attention to it... at first.

Irene tried to hide her feelings for Wendy. But during their dinner, her emotions just exploded.