it doesn't solely focus on the cheating part, mc took justice for her other self (the other mc) and decided to take revenge on that whore who stole her other self's happiness, ofc, by also stealing the whore's adventure points and gaining more power- making her (or themselves?) an op mc (slay :9)
You may feel your favorite manga should be gathered together into distinct categories for your own reference and, now, you can do this with a LIST. After you've created your list or lists, you can proudly recommend them to other manga fans to showcase and share your taste in manga.
The One Within the Villainess