Han Jisung

10th grade—new opportunities and subjects. Along with that, a new student in your class—Choi Lia. You and your best friend, Jisung, were both triggered by this, as new students in your class were usually the odd ones out.
And then, at assembly, a girl of about 16 joined you, skinny, shorter than you. You had your doubts about her, but she seemed normal. Only six months old.

After three or four months, you and Jisung began to notice that Lia was starting to distance you from him, asking you to walk around the school alone during breaks, etc.
Now you've reached the history room and left your bags there, and you have a 20-minute break before class. You and Jisung were about to go to the cafeteria together when Lia approached you, or more accurately, Jisung.

Leah: Sony, let's go for a walk around the school?
She said it in a soft, plaintive tone. And only you called Jisung that.