Adopted into an Irish family as a child and raised in Ireland, Lee Joong-ah (Lee Na-young) is devastated when her entire family is killed after her brother gets involved with the Irish Republican Army.

[1] Deeply traumatized, racked by guilt and suddenly rootless, she decides to journey to her homeland to search for her biological family.

She quickly meets Kang Gook (Hyun Bin), a kind, solitary bodyguard who offers to help her in her quest.

Fate has her cross paths with her biological brother, Jae-bok (Kim Min-jun), when she saves him from an accident, but they part not knowing they are related.

Jae-bok is a slacker living with his girlfriend Si-yeon (Kim Min-jung), a kind-hearted adult film actress who is her family's breadwinner.