BEFORE THE CRASH:
- A fisherman's son who courted Sun in secret but insisted on asking her wealthy father for permission to marry
- Worked for her father as an enforcer after their wedding
- Refused to tell Sun about her father's shady dealings
- Ordered by Sun's father to kill Jae Lee under the pretense of stealing money and shaming Paik
ON THE ISLAND: Believed to have perished in the freighter explosion, but was rescued by a young Danielle Rousseau and her science team. He reunited with Sawyer's group trapped on the island in the '70s and became a member of the Dharma security team.
Survived the detonation of Jughead and is back in the present-day time period on the island. Nominated as a candidate to take over Jacob's job as protector of the island.
Reunited with Sun after an epic journey across oceans, the island and even time. Sun returned his wedding ring to him, but they were double-crossed by Locke when they thought he was helping them leave the island. After the explosion on Widmore's submarine, Sun was trapped behind a heavy cabinet. Unable to free her before the cabin filled with water, Jin stayed with her promising her he'd never leave her again. They drowned holding each other's hand.