Becomming part of a family...
Bohm(Spring in Korean), on his way to give his dad, Detective Kim,(who's been working for 10-days-straight) some underpants at the police station, sees a girl by a vending machine and wishes to see her again...
Mahnsoo, the only witness to an important criminal case must undergo a disguise as a girl and stay together with Detective Kim's family until the investigation is over and the case ends. So he meets Bohm again, and apparently he looks awfully similar to a girl that Bohm misses when in disguise...
Will they get along?
