Help me find this manhwa

The mc is black haired psychopath who likes his brother (if i'm not wrong he's a stepbrother). The bro is a red hair who's smile is as bright as the sun. The mc goes into psycho mode when his bro got a gf. But i don't really remember the plot, but i'm pretty sure the mc is dead by the end of the story. The artstyle is great, something like season 1 of lost in the cloud? I think? I remember the cover got snowy background too