Part 1

Kai and Koa are twins. They look undeniably alike, despite Kai being a girl and Koa being a boy. The only difference is their personalities. What happens when Koa asks Kai to pretend to be him and work as a teacher for a while at Teudoongi School for Girls? There she meets a group of lively and mischievous students who think she is her brother Koa. As Kai navigates through her new role, a student keeps trying to get her attention. This student seems particularly interested in "Koa." As their interactions become more frequent, Kai finds herself drawn to Mina. However, keeping up the charade becomes increasingly challenging as she starts to develop feelings for Mina. Would Mina be able to accept Kai for who she truly is, or would the truth shatter their growing connection?