Someone tell me I'm not going crazy

Basically I could've sworn there was this bl manhwa Abt a guy who gets isekaied into an otome game that his sister plays and he knows the whole plot of the otome game bcs of his sister but now when he's in the game all the original love interests starts shting on female mc of the game and no one payes her attention basically and the male lead of this bl manhwa is the prince I think
Also I'm pretty sure he gets reincarnated as the villain's brother
Can someone confirm that this is not some crazy dream that I just had bcs it's too vivid