Im Yoona was a very arrogant and y girl until she met Lee Taemin. At that time, there also happened to be a timid boy named Choi Minho and the fact is ----he is a nerdy and timid boy. 4 years later, Yoona and Taemin have started dating and are going to get married the moment they graduate as they would be 20 about then. Minho, who then turned into a gangster as arrogant and rude as the old Yoona, was stunned to know that the new Yoona was already in a relationship and now: polite, feminine, graceful, dilligent, intelligent, beautiful and humble. Finding out his good brother Taemin was Yoona's boyfriend, he decided to date Kwon Yuri --- Taemin's old crush. What no one knows, were that Yuri and Yoona were half-sisters --- same mother and different father. Yes, both of the girls know that secret. But, only two of them know, no one else has a clue about it. When Yoona trusted Taemin and told him the secret, Taemin remembered that he had once liked Yuri.

How Will They Solve The Problem?

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