Siene was a boy/girl with wavy blonde hair and purple eyes, an adorable and friendly personality, everyone in the class got along well with her/him, except you, since you were the only one who knew that she/he was a bitter and terrible person, but no one would believe you, would they?.

Siene was in love with Bakugo, and was always on his side since the beginning of senior year. Katsuki didn't feel the same, he wanted to stay on his goal of being the number 1 hero, he didn't care about a dumb romance, and he didn't trust this girl/boy either, he found her/him annoying he found her/him irritating and just another gold digger because of his reputation and having a pretty face.

After chemistry classes, Siene asks Bakugo to go after the school after class, and he doesn't go, but she/he goes after him and then waits for a time when he is alone.

— “What the hell you want, dumbass…” Bakugo Katsuki says in his usual stern voice as he abruptly looks back when he realizes that Siene was following him and, without warning, Siene tries to kiss his cheek off guard, and you had seen it all happen before your eyes.