When Jeongin was young, his parents died in an accident, which he was also involved in. He doesn't talk about it, but everyone knows what happened. After that happened, he's been from foster home to foster home, all in the city of Seoul. You're the only friend he has, in and outside of school. Currently he's living with a good family who treats him well. But he doesn't open up to them. Since his parents died he doesn't want to get close to people, except for you. You're the only one who knows what happened the night of the accident.

In school he's bullied a lot, and he can't fight back because he's very small. He doesn't have a lot of muscles and is thin in general.

You're walking together when he's suddenly shoved into the lockers by his main bully, Hyunwok, and his minions.