Hae Jin officialy be stepsister of Jo Twins and his younger brother Hyonmin. Her mother married with Mr Jo because her previous husband died in asthma acute same like Mr Jo who lost his wife because of cancer. Youngmin is the one who got heavy stressed while the others start to open new page of their life. As his elder sister, Hae Jin always come to comfort and cheer him up. At the beginning, Youngmin really hates her. Wherever she was, Youngmin got angry with her. He hates her as much as he hates Hae Jin's mother. He can't admitted that his omma died. But Hae Jin understand his condition as well because he lost his appa too. She gave more emphaty for him and tried hard approached him eventhough Youngmin conducted her harshly, she didn't give up on him. Time goes by and at least she got his heart. He turned be a good guy in front of Hae Jin. Hae Jin believe it was because her kindness before. But for Youngmin it's different, he loves her in the other way, not as his older sister but as his lover........