Decision to Leave

Insomniac detective Hae-Jun works in Busan and only sees his wife, Jung-An, a nuclear power plant worker residing in Ipo, once a week. Hae-Jun and his partner, Soo-Wan, encounter a case where a retired immigration officer, Ki Do Soo, is found dead at the foot of a mountain he often climbed. They interview his much younger wife, Seo-Rae, an emigrant from China who works as a caretaker for seniors. They suspect her because of her insufficient displays of grief, a scratch on her hand, bruises on her legs and torso, and a tattoo of Ki's initials in the manner that he also marked his belongings.

Hae-Jun conducts further interviews with Seo-Rae and conducts nightly stakeouts outside of Seo-Rae's apartment building, becoming infatuated with her in the process. Seo-Rae observes him outside her building, and witnesses one of his other investigations in turn. Seo-Rae's Monday client says Seo-Rae was with her on the day that Ki died, and camera footage is found showing Seo-Rae outside her Monday client's home shortly before Ki's time of death. Questioned about her background, Seo-Rae admits that in China she killed her mother with fentanyl pills; her mother was terminally ill and asked her to do so. Before dying, she told Seo-Rae to go to Korea to climb the mountain her Korean grandfather, an independence fighter in Manchuria, had left her. Seo-Rae gives Hae-Jun letters written by Ki admitting to being corrupt, including a letter sent to a subordinate that Hae-Jun interprets as a suicide note. Hae-Jun rules that the death was a suicide despite Soo-Wan's doubts and informs Seo-Rae that she is no longer a suspect.

Seo-Rae and Hae-Jun go on a date at a Buddhist temple, visit each other's homes, and become close. During a visit to his apartment, Seo-Rae burns Hae-Jun's photo evidence from her husband's case, reasoning that Hae-Jun's insomnia is caused by his haunting cases. One day, substituting for Seo-Rae at her Monday client, Hae-Jun learns that Seo-Rae and the client have the same model of cell phone, and that the client has dementia and does not know the day of the week. On the client's phone, he sees that the housebound woman apparently walked up 138 flights of stairs on the day of Ki's death. Hae-Jun realizes that Seo-Rae switched her phone for her client's and then climbed the mountain to push Ki off, resulting in her bruises and scratches. Confronting Seo-Rae in her apartment, he concludes that she also forged the suicide note and, to her consternation, accuses her of getting close to him to destroy his evidence. Hae-Jun tells Seo-Rae that she has destroyed his pride in his job and that, since meeting her, he has become "shattered"; nevertheless, he tells her that he has covered up the evidence and instructs her to throw the incriminating phone into the sea before leaving.

Thirteen months later, Hae-Jun has moved to Ipo to live with Jung-An after developing depression and more severe insomnia. At the fish market with Jung-An, he encounters Seo-Rae with her new husband Im Ho-Shin, a business investor. The next day, Ho-Shin is found dead in his mansion's swimming pool. Hae-Jun takes on the case and is convinced Seo-Rae is the culprit. She admits only to draining the pool so that Hae-Jun would not be disturbed by the blood. Sa Cheol-Seong, a Chinese immigrant, soon confesses to killing Ho-Shin for defrauding his late mother of millions of dollars. Sa denies that Seo-Rae played any role and reveals he had installed a tracker on Seo-Rae's phone so he could find where Ho-Shin lived.

Hae-Jun confronts Seo-Rae at the mountain her grandfather left her. She reaches Hae-Jun at the edge of the mountain and hugs him. Seo-Rae reveals that she kept the phone with incriminating evidence from Ki's case and proposes that he use it as a way to "reinvestigate" her. They kiss passionately. Jung-An leaves Hae-Jun when he returns home, suspecting his affair.

The next day, Hae-Jun learns from Sa that Seo-Rae visited Sa's mother in the hospital on the day that she died. He concludes that Seo-Rae slipped the mother the remaining fentanyl pills she had in her possession, knowing Sa would kill Ho-Shin as soon as his mother died. Hae-Jun tracks Seo-Rae's phone via the tracker Sa installed and chases her to a beach. Over the phone, she tells him that Ho-Shin had discovered a phone recording where Hae-Jun told Seo-Rae that he loved her, and that Ho-Shin had planned to expose their illicit relationship. Hae-Jun doesn't recall telling Seo-Rae that he loved her, though she says she began loving him as he stopped loving her. At the beach, he finds her empty car and the cell phone, which contains the recording of his instructions for Seo-Rae to destroy the phone with evidence from Ki's case. Further out on the shore, Seo-Rae digs a pit in the sand and gets in it as the tide rises, letting it drown and bury her. Hae-Jun arrives at the beach and is unable to find Seo-Rae, unaware that she is buried in the sand beneath him. He searches desperately for her and cries in anguish.

The film is produced by Moho Film and is financed and distributed by CJ Entertainment. It began principal photography in October 2020.[17][18]

Decision to Leave was selected to compete for the Palme d'Or at the 2022 Cannes Film Festival to be held from 17 to 28 May 2022.[19] It screened for the first time at the Lumière Grand Theater on 23 May 2022 and was subsequently released theatrically in South Korea on 29 June 2022.[20] According to CJ E&M, the film was sold to 192 countries ahead of its premiere in competition at Cannes.[21][22]

In April 2022, streaming service Mubi acquired the rights to release the film in North America, the United Kingdom and Ireland, India and Turkey, to be streamed after its theatrical release later in the year.[23]

Decision to Leave had its North American premiere at the Toronto International Film Festival in September 2022,[24] and its US premiere at Fantastic Fest Film Festival took place in the same month.[25] It was released theatrically in the United States and United Kingdom on 14 October 2022,[26] and was released in Australia theatrically by Madman Films on 20 October.[27]

• List of submissions to the 95th Academy Awards for Best International Feature Film
• List of South Korean submissions for the Academy Award for Best International Feature Film

• Decision to Leave at IMDb 
• Decision to Leave at the Korean Movie Database
• Decision to Leave at HanCinema
• Decision to Leave at Naver Movies