Info from WIKI

Seongbin was a charismatic and manipulative student. He is able to remain calm in most situations (when he wants to) and also very smart. Due to his popularity (though most people secretly hate him) and good grades, he is seen as a model student, particularly by people who don't know him personally, like Jayden. He is always being followed around by his group of friends who do what he tells him, especially Chanhyeok and Sanggwon.