they were supposed to be enemies, who hated each other to death, why now "Mu" (his nickname) treats you better and tries to be close to you?

You didn't know it but you really were a bet, the bet had been made between Mu and Mu's friends, this was that if he managed to make you his girlfriend or at least kiss you, Mu would win and his friends had to do it. give him money

You were sitting in the classroom that was empty until Mu came in and sat in front of you, he grabbed one of your locks and started playing with it trying to get your attention

"stop what you're doing and focus on me"

pretended to pout even though inside he still hated you and hated doing this