I was thinking maybe he has a relation with the ghost woman of the isolated palace. Since tiger hair color is thr same and he wants to avenge that woman.
Their. Damn auto correct
Ooooh, I didn't think about that, interesting theory
Maybe he is her son
Maybe he is her son , there is a possibility
Oh damn, that's a interesting thought
Waaaait.... What if Oscar is emperor's brother? He has the same red eyes as him, he came from palace... Maybe he tried to kill the emperor, he failed and the emperor said that if he wants to live, he will be a servant of the parlam family. This is just my theory, I'm really curious who he truly is. (๑•ㅂ•)و✧