Just a gist of it as I skimmed through the Korean raws.
The uke doesn't know the seme has a twin. Plus the seme has been fucking up the uke's life back when they were in high school. He put his then bf into coma, also made the bf's parents' company go bankrupt. The seme's other twin raped him to rile up the seme. The seme n his twin have already dug up info on the uke n his twin. Also the seme is pretty much psycho as he put his own father even in hospital by poisioning him (mayb for the uke to pity him/ something). The uke's parents died in a car crash . The uke's twin brother got injured by the guy whom he had sex with in the first chapter. The ending shows the uke receiving a parcel that contains evidence that the seme is behind all the shit that the uke is going through ( from his parents dying , bf in coma , his twin injured etc.) . It's kinda like lima syndrome
saw that one topic below me about spoilers, they did warn me but goddammit... why did i do that? now i spoiled myself about the ending ヽ(`Д´)ノ