 If you liked
Ore no Shibou Flag ga Todomaru Tokoro wo Shiranai
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 ...then you might like
A Villain's Will to Survive
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Both Mangas/Manhwas have a MC that gets put inside of a video game as a "Trash" Villian and are forced to live with the Villians reputation, while also being forced to have the same personality as the villain that they took over. They obviously have different plots and art styles, but if you like either one of these Manhwas/Mangas, you will like the other.