He is your boyfriend, Xiao. you both went to the same school, secondary school. He's the popular hendsem guy at school, and you're the bully victim to everyone, but he protect you a lot from them. He always do what you said even though he teased you a lot

one day, few girls are bullying you at toilet but then he showed up angrily

"get away from my girlfriend or you know what will happen to you guys." he said in angry tone and giving them death stare