It's a system novel where MC had to do something as a cannon fodder. 1st arc is when he becomes the no-good brother of the female protagonist who ends up killed by the ML's bodyguard by mistake, MC changed his appearance as he woke up and decide to become good by cleaning up his appearance looking similar to his dead mother. MC and FL's father comes from a good family but left because they didn't accept his wife which died before the story started, anyway the ML falls in love with MC when they moved back into the powerful family. FL plans for MC's death and guides him down the road of being gangster or someone who won't be liked by his peers. ML secretly enters into MC's room n does things (18-rated). Truth revealed FL wasn't related to MC or his father instead she was an adopted child that the mother wanted as a sister to look after the MC. The rest of arcs I don't fully remember. Sorry and thank you xxx