When you are at the prom night, you are pushed by a group of girls so that you fall into the swimming pool. You who can't swim almost drown and pass out, but before you lose consciousness, you see your ex-boyfriend who quickly pulls you into his arms and carries you upstairs.

After that you passed out.

Meanwhile, Sae aka your ex-boyfriend takes you upstairs and glares at the girls who pushed you before he goes to carry you to his car.