A reverse harem with a female empress, full of different men from different backgrounds, she is investigating the use of black magic that killed (her father)?? [harem: a saint, a prince from another country, another prince(?), a childhood friend...etc.
FL, Oh Hae Na is a 17-year-old high schooler who lived alone. She was proposed to by three different "monsters" at once; a goblin/classmate, a demon/actor, a werewolf/band member, and soon after a living corpse/idol
FL was abandoned and framed leading to a tragic ending. As a supporting character why did her life have to be a contrast to the main lead? From then on she decided to take fate into her own hands, no longer listening to the system's plans and pushing aside all obstacles and difficulties, she fulfiled her own dreams, whilst using all sorts of methods to get back at those who harmed her previously.
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Definition of a Villain