Jung Soojung or in Julliard, Krystal. A double major student, piano and vocal. Her sister, Jessica, dragged her to spend her break on Seoul. Jessica wanted her to stop studying and actually enjoy a life outside Julliard. Her sister's bestfriend has a younger brother, Lee Taemin. A dancer. Yep, which comes next, a troublemaker. He's not actually the typical troublemaker, he just like to prank some naive people, despite that, he's good at studying.

Krystal and her sister had to stay at her bestfriend's place during their break, with Taemin's endless pranks, can she survive for the whole spring break?