The Male Leads Were Stolen by the Extra

So grace aka og fml, the real owner of the MC body, is just a spoiled, lazy, stupid and selfish bi***, she and her father kill countless people to put their soul into body of grace, as for what happened to the poor ''REAL grace'' I have no idea, MC just a Korean girl who got herself in the middle of this bullshit, Just because this brat wasn't going on the journey because she didn't like it, for some reason she knows the plot (the future), so she did all this because she thinks she's the MC of the word and everything its just there to make her shine, like she is the fuc**** sun, the most important sh** ever, she use dark magic on all the m'ls and blah blah blah, this end very shi***, all the shi*** behavior of those scums ml's its just ignored bcuz, haa they are brainwashed so its not their fault, The bi*** reason is so full holes and without any logic, like how the fu** she even is the fml from the og story ? Like who wants to read about a lazy, selfish bi*** full of delusions ? She is so fuc**** one demension character that her only reason to exist in the plot, its just to make us hate her and MC shine more, the shitheads ml's all end pretty much good, of course they regret and are used like some TP to clean the bi*** sh**, but they don't get their deserved ends that we all wish for. This story its just a great wasted of time. BUT IF YOU IGNORE ALL THIS AND TURN OFF YOUR BRAIN, then i guess this can be fun for you