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All I can remember is that the mc has a twin brother. His twin was adopted by a wealthy family but the mc was poor. His twin brother was supposed to marry someone but he took his place instead. The persons whose going to marry the mc was actually looking for him for a long time, he met the mc at an alley and they fought and I guess that person lose. I think he was a prince or a wealthy person. That's all I remember. Thank you for you're help (づ￣ ³￣)づ