After a film premiere, a famous actor is kidnapped in the middle of Seoul. Thinking it is a prank, the actor is relaxed, but when he faces cruelty, he realises the gravity of the situation. He tries to find an escape route as kidnappers demand a huge ransom within 24 hours. Then the struggle begins, which is very different from what he has seen in films.

Sang-hyeon (Song Kang-ho) is the owner of a launderette and a volunteer at the nearby church, where his friend Dong-soo (Gang Dong-won) works. The two run an illegal business together: Sang-hyeon occasionally steals babies from the church's baby box with the help of Dong-soo, who deletes the church's CCTV footage that shows a baby was left there, and they sell them on the adoption black market. But when a young mother, So-young (Lee Ji-eun), comes back after having abandoned her baby, she discovers them and decides to go with them on a road-trip to interview the baby's potential infertile parents. Meanwhile, two detectives, Soo-jin (Bae Doona) and Detective Lee (Lee Joo-young), are on their trail.

Connected by phone in the same home but 20 years apart, a serial killer puts another woman’s past — and life — on the line to change her own fate.