Song-yi's ex-boyfriend from college, Seok Jin-ho, lives upstairs, and at the English kindergarten, she runs into her ex-best friend, Ha-na, who suddenly starts acting friendly. Ha-na, a working mom, is dealing with a crisis at work, and Song-yi unexpectedly finds herself taking care of Ha-na's kids. This helps them overcome the awkwardness that had grown between them.

Song-yi goes to a motel to help Jin-ho but ends up getting entangled with Hyeon-woo again. At the English kindergarten's Father's Day event, cafe owner Yi-an joins in, and a sports day takes place amidst the competitive spirit of the kindergarten moms.