The bullies in manga and manhwa are weird, most bullies i can think of don't like physical confrontation since it makes you go from easy target to inconvenient and it CAN make them stop, but in these fics thats the worst thing you can do since fights excite many of them apparently. In these kinds of fiction, there is no fundamental way to get rid of bullies beyond being so unassailable that the endless congo line of bullies can never actually beat you.