All In part1

In-ha(Lee Byung-hun) was born as an orphan and lived a rough childhood with his father's friend who was a gambler. Then, he meets Su-yeon(Song Hye-kyo) and falls in love with her. However, he is accused of a murder due to an incident and flees to the US. In L.A. and Las Vegas he gets to know a poker professor and enters the gambling world.

He wins the international poker championship as a pro gambler and enters the hotel management and casino business. While Su-yeon studies in the US, she receives Jung-won's help and later marries him after a long courtship. Eventually, In-ha returns to Korea, but Su-yeon's heart aches for In-ha who suddenly appears.

She had believed that In-ha was dead. In-ha and Jung-won(Ji Sung) get entangled in an once-in-a-lifetime battle