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Haeun has a step brother who's a gang leader and she gets blamed for everything he does. When her brother makes it so that she is late for class, she has a strange encounter- the encounter that makes her a housemaid for the rest of the year. Haeun, who hasn't even had her first kiss yet, decides to take revenge. But when she finally kisses someone -and it isn't pleasant- what will happen?
Similair: Both mangas have a siblings love relationship. Diffrence : in kiken junai D.N.A. the brother is a cross dresser while forbidden kiss has no cross dressing. Sorry its so short but this is about all I can remember right now.