Responses
He was kidnapped as a kid so he had no memories of his real parents. He ran away from the kidnapper who abused him and found Minjae 's father and asked to be adopted.
Okay that's even more messed up ┗( T﹏T )┛
Thanks for the reply
Hmmm why do I feel like Sejin was really his parents child and the dad abandoned him but changed his mind and took him in as his stepson just to make his life difficult #－.－) spoilers please