Gonna lose it if I don't ask

Looking for an older webtoon(?) manhua/hwa(??), about a boy who is like a yandere (I think), and obsessed with his brother (I...it was a psychological plot, idk hat to tell you) and his brother has red hair, I think. I can't remember the plot well but the brother dies at the end and the dude ends up in like a mental ward or smth.

Please someone know what I'm referring to, this is driving me nuts, I read this years ago.