Aaah, I've read too many novels at the same time that I'm starting to forget which is which. For this novel, the MC is an idol (rebirth?) and likes to make video game techniques. The MC plays this game with another idol; and posted a picture online to show that he isn't bothered with all these drama from the entertainment industry. I think they were acting too..? The MC recorded two girls (one was the original's love and the other was the woman the original played with for his own benefit) fighting and ruined their careers. That's pretty much all I remember ㅠㅠ ) Thank you..!
I believe that is "There Will Always Be Protagonists With Delusions of Starting a Harem". And that arc is the second Here the link: www.novelupdates.com/series/there-will-always-be-protagonists-with-delusions-of-starting-a-harem/