Rain Outside the Porthole(1970)

Original title: 비나리는 선창가

In 1946, Tae-woong, a man nicknamed "The Bear" who dominated the streets of Busan with his fists, have returned after twenty years. Tae-woong is still haunted by his former love, Yeonsuk, and is confused when he meets Jung-hee, who looks exactly like Yeonsuk. Meanwhile, Dal-ji, a former subordinate of Tae-woong's, schemes to get rid of him.