F4 is a group of 4 friends Thyme,Mj,Kavin and Ren who are heirs to the famous groups of thailand and are one of the richest persons in the world.They are the richest kid in Kocher High And thyme's family owns kocher high.. They are bullies and the other students do what they say. F4 have a "red card game" in which if a student pisses them off he gets a red card, mostly in his locker. Its announced in the school group and everyone is allowed to do wtv they want to the one who got the red card