Jae-hyuk becomes so in love with her which breaks Tae-hee's heart. He aborts his revenge plan in order to run away with Sun-woo, but the grandfather soon finds out and sends him to prison for a few days before Tae-hee bails him out. Unable to forgive Tae-hee's grandfather, Jae-hyuk ends his relationship with Sun-woo and engages to Tae-hee. Sun-woo moves out on her own and subsequently becomes ill. She is diagnosed with leukemia, which can be cured only if her sibling or relative donates suitable bone marrow. As Sun-woo cannot remember any of them, she is ready to give up and spend her time left with Chul-woong. In the meantime, Tae-hee's grandfather assigns his chauffeur who is Chul-woong's father to find his real granddaughter. Being told by Seung-hee's step-father, Chul-woong's father informs that his missing granddaughter is indeed Sun-woo, who recently gets fired by him for the sake of Tae-hee and Jae-hyuk. In shock and regret, he rushes to see Sun-woo before the car accident kills him, as well as puts Chul-woong's father in a coma. Seung-hee bribes her step-father to keep secret, which makes him (and his wife) feel bad for Sun-woo. Jae-hyuk, who never stops loving Sun-woo, secretly covers her hospital bills while looking for evidence to expose Seung-hee. By chance, he meets Seung-hee's step father and is revealed the truth about her, which he tells Tae-hee right away. At this point, Sun-woo dreams about her father and the family's past moments. She wakes up as soon as Tae-hee arrives, the sisters share a long hug upon reunion. After kicks Seung-hee out of the house, Tae-hee donates her bone marrow for surgery to save Sun-woo. Sun-woo forgives the Ohs, but Seung-hee still holds grudge against her. Sun-woo recovers well from the surgery. Jae-hyuk maintains a good companionship with Tae-hee while trying to get back with Sun-woo. Understanding her sister's feelings, Sun-woo rejects Jae-hyuk and accepts Chul-woong's marriage proposal. Before their wedding, Seung-hee orders a gang to kidnap Sun-woo. In order to protect her, Chul-woong fights against them and gets stabbed, thus dies in Sun-woo's arms and tears. Seung-hee is put to prison and still blames Sun-woo for having stolen her entire life from her. Jae-hyuk is taking a flight to U.S. Sun-woo, all of sudden, shows up at the airport and they share a brief farewell moment. Sun-woo and Tae-hee return to the house where they lived as