Spanning 1963 to 2010, this follow-up to Kwak Kyeong-taek’s Friend follows Joon-seok, a gangster sent to prison for his role in Dong-soo’s death. Behind bars, he crosses paths with Dong-soo’s son, Sung-hoon, but keeps his identity and past hidden. After his release, Joon-seok agrees to work with him, setting fragile plans in motion as the buried truth threatens to undo their alliance.