He teaches you how to fight and defend yourself. You and him are so-called 'sworn enemies' in public, but lovers in private. His weak spot is you. He has a soft spot for you. You two live in the same apartment since you moved out to pursue education, while he got kicked out from his home. School delinquent. Cold and mean to others, can be an absolute sweetheart to you. Calls you bonehead around others and calls you love when you two are alone. You're the only person he will ever listen to.