Piano

Han Eok-kwan (Cho Jae-hyun) is a ruthless, foul-mouthed small-time gangster in Busan. When fellow gangster Dok-sa (Lee Jae-yong) betrays their boss Byun Hak-soo (Im Dong-jin) to take his place as the new boss, Eok-kwan is exiled from the gang. Then a former lover contacts him to meet her in Seoul, but once he gets there, all he finds is a 10-year-old boy named Jae-soo, who claims to be his son. At first he plans to abandon the boy, but unable to do it, ends up raising him. Shin Hye-rim (Jo Min-su) is a widow with two children, 12-year-old daughter Soo-ah and 10-year-old son Kyung-ho. After her husband, a district attorney, dies, she leaves Seoul with her children and moves to Busan, where she opens a piano school. Eok-kwan falls head over heels in love with the piano teacher, and they later marry. Shortly after, Hye-rim dies in a boating accident. Soo-ah and Kyung-ho, who've always resented their new stepfather, blame him for her death and try to leave the family home, but Eok-kwan begs them to stay. Transformed into a loving and hardworking father, he raises the three children to the best of his abilities. A few years pass, and all three children, and their sister Joo-hee (played by Kim Hee-jung first, then by Jung Da-hye), are now young adults. Unbeknownst to Eok-kwan, his biological son Jae-soo (Go Soo) and stepdaughter Soo-ah (Kim Ha-neul) are deeply in love with each other. Though not related by blood, they know that a romantic relationship between them would be taboo, so they suppress their feelings. After Kyung-ho kills a man attempting to rape Soo-ah, Jae-soo takes the rap and goes to prison in his place, with his spotless record ensuring a short sentence. Kyung-ho escapes to Seoul. When Jae-soo is released from prison after several years, he studies to become a doctor. Soo-ah meanwhile works at a record shop. Kyung-ho, still a rebellious and angry young man, returns to Busan and becomes involved in the city's criminal underworld.