Nope, if I remember right he's the mistress's kid. And I suppose, to hide the crazy abusive woman, Siwoon's father got her into an asylum. That's the picture. And he took Siwon to pose as his healthy legitamate heir while the true heir is receiving treatment for what looks like a terminal illness.
I just read the entire story again and yeah, she used to hit him and put him in a storage place (where Taemin found him and saved him).
So I remember right then. Thanks
Oh I see. Thanks
Wow. This is getting more interesting. Finally we may know why Siwoon/woojin suddenly left when they were young. A question though.. Didn't his mother (the blonde one in a wheelchair) used to hit him as a kid? Or am I confusing this with another manga? Damn.