Six years after the Hawaii airplane hijacking, Mi-yeong finds herself struggling with her rebellious teenage daughter, Nari, and her unemployed husband, Seok-hwan. When Hyun-min, a flight attendant she met during the hijacking, invites her family to his wedding aboard a luxury cruise ship, Mi-yeong eagerly proposes a family holiday. Met with indifference from her husband and daughter, she decides to embark alone, joining Hyun-min's family and Ji-hoon, a charming magician. However, on the eve of the wedding, the celebration turns deadly when armed assailants seize the ship. After Seok-hwan and Nari are kidnapped and brought aboard, Mi-yeong discovers that she is the target of a much larger plot.

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