Why does he want him to stay inside? That's suspicious...like he wants to protect him...no...

right, but he would have preferred if he would had died in that accident, or at least never woke up again....

I don't think so it seems like he's the bad type possessive like his own personal toy he can break and harm whenever he wants and he's pissed his "toy" is fighting back and I feel like maybe the original si won did something...maybe had a supernatural power or something that made his brother start calling him a freak and that might be involved with how tae min is now in si won body? I'm just making up random stuff trying to figure out the story.

I don't understand? Actually it seems like the brother is pissed off because he's not the center of attention like he's 'SUPPOSED' to be. I mean, it would make no sense if he thought of his brother as a toy and wished he had stayed dead at the same time. And why does everyone keep assuming that Si Won had to do ANYTHING to piss his brother off? Just by existing seems to be enough to me to upset his piece of trash brother's little ego. He's such a weak ass little bastard. Who needs to die SLOOOOOOWWWWLLLLLYYYY in an effing fire. That would be the only ending that would make me happy.

I'm trying to come up with something and yea it could be that his bro is just an asshole ....well he already is but it's just something I thought up but it could explain why he wants him to not go near people I could be totally wrong but it is a possibility and would explain why they somehow switched bodies to but yea......his brothers an asshole

Lol, I just laughed at your comment. Yeah, I do have to admit that this is how the manga makes me feel, too. I just can't understand how people can have such rotten personalities and I end up thinking about ways that that could happen even though I tell myself not to. *Sigh* So, yeah, you could be right, especially as an explanation for the body switch. :)