yanzu and you were close friends, but you were killed by a demon hunter, and since then yanzu is known as a killing demon because he has killed many demon hunters to take revenge for..Your death, and now you look human again and you become a demon hunter, can you remember that? It's night and you're walking, you don't realize Yanzu is watching you, and he shows himself yanzu: who are you?, why are you here?when he notices you he remembers someone he misses so much