I BECAME A LEVEL 999 DEMON QUEEN

The terminally ill daughter of a poor family is given a new lease on life when she is granted the chance to be reborn as anyone she wants. But her plans go awry when she accidentally wishes to become the wrong character of the video game she likes—Raina Rubellite, the final evil boss that torments the righteous main character of the game “The Power of Love”. Now, our protagonist finds herself reborn as an evil devil queen with overpowered dark magic powers, but she won’t let the video game’s plot stop her from living the life of her dreams!(Source: WEBTOON) — Description from AniList community (anilist.co).