THE MAN WHO WAS THURSDAY is inspired by the existentialist novel of the same name by G.K. Chesterton (1908). The novel is considered a metaphysical thriller, and our film could be considered the same, though it also can be thought of in more classical cinematic terms a psychological and supernatural thriller.

After recovering from a near-fatal wound, a cop develops the ability to see crime scenes through psychic flashes.

Jinju, who used to frequent a bar in the past, is approached by a man who claims to have sex videos of her past. Feeling anxious about the situation, Jinju agrees to give the man a large sum of money to prevent him from contacting her again. However, the man squanders the money on gambling and finds himself in a desperate situation. He reaches out to Jinju once more, demanding more money. When Jinju doesn’t respond to his demands, he resorts to sending a woman to seduce Tae-soo, Jinju’s lover, in an attempt to manipulate Jinju into giving him the money he desires.

Matsuda's signature is needed on some final documents to wrap up the Kira case. However, Matsuda refuses to sign. Seeking closure, Soichiro Yagami tells him to visit Ryuzaki so that he may understand L's sense of justice.

Matsuda's signature is needed on some final documents to wrap up the Kira case. However, Matsuda refuses to sign. Seeking closure, Soichiro Yagami tells him to visit Ryuzaki so that he may understand L's sense of justice.

A publisher is nearly framed for murder, but he appears to have been goaded by the blackmailer who has also blackmailed the publisher's wife.

Mob tries to avoid being the main character in a BL world, but as love finds him, he must choose between staying in the background or embracing romance.

Lee Roo-Ri tries to get a job at big company, but she gives up. She doesn't have a good relationship with her strict father. Lee Roo-Ri decides to travel to a foreign country to get away. There, she meets Jung Tae-Yang who goes by the YOLO motto. He wanders around the world and places priority on his happiness, but he also carries an emotional wound.