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I’m pretty sure this is a romance manga.(can’t remember if it’s Korean or Japanese) The world setting, there are people who live underneath and people who live above. People who are living under are poor people and people that don’t have power. Looked down upon. While the higher are more well off and have status. The girl falls in love with her childhood best friend. Years past and when they grow up, the best friend kills her parents, has an underground war, and takes a portal to the world above. Leaving some people still down there, (Mc included). Years pass and she learns magic?(I believe) and she becomes high status because of this allowing her to live on the top. That’s all i remember.