Hyuk-soo, who lives alone with his sister, wins a gold medal in welding at the National Skills Competition, earning a spot in the international tournament. Meanwhile, Jae-soo, who won silver, laments that he cannot compete internationally. However, when it is revealed that Hyuk-soo has a criminal record and the qualification is transferred to Jae-soo, Hyuk-soo falls into a pit of self-loathing and delinquency. Later, upon learning that Jae-soo's parents are deaf-mute, Hyuk-soo sets aside his own misfortune and begins to train Jae-soo in the craft. Thanks to Hyuk-soo's dedicated guidance, Jae-soo wins the gold medal at the international competition. Afterward, Jae-soo visits Hyuk-soo at the shipyard where he works and places the gold medal around his neck.