Lui, a top assassin in a secret organization that eliminates corrupt politicians untouchable by law, decides to retire for a peaceful family life. But he’s hunted down, and his wife and child are killed. Pakasit, his leader, tricks Lui into believing his best friend Duean was behind the murder, leading Lui to kill him—only to discover the truth too late. Devastated, Lui takes in Duean’s son, Boy, with help from his ex-lover Soysiri. Together, they raise Boy and form a deep bond.