Tengoku to Jigoku: Psychona Futari (2021)

In both of these series, an innocent person is forced into the position of a serial killer, in Tengoku to Jigoku it's through body-swapping, and in Psychopath Diary it's through amnesia. They also both include police investigation and a bit of mystery.

Both features a forbidden relationship between the suspect and the police officer, and have some painful mystery to uncover. But Tengoku to Jigoku has some supernatural themes, while Saiai doesn’t. Tengoku to Jigoku is also more comedic than Saiai.

Genres: Thriller, Psychological, Drama, Melodrama
Tags: Hidden Identity, Revenge, Adapted From A Novel, Wrongfully Accused, Prison Escape, Murder, Injustice, Torture, Corruption, Death

Genres: Comedy, Youth, Supernatural
Tags: Student Male Lead, School Setting, Childhood Friends' Relationship, Classmates' Relationship, Samurai Male Lead, Teenager Male Lead, Magical Object, Flashback To Past, Miniseries, High School

Genres: Thriller, Mystery, Romance
Tags: Plastic Surgery, Hidden Identity, Suspense, Plastic Surgeon Male Lead, Illegal Business, Conspiracy, Disability, Illness, Stolen Identity, Identity Swap

Genres: Comedy, Romance, Fantasy, Melodrama
Tags: Rags To Riches, Character Development, Second Chance, Spirit, Detective Supporting Character, Transmigration, Supernatural

Both are mixes of many genres — Comedy, mystery, thriller, etc. FL and ML are enemies, then partners. ML is suspicious af, with a front of a perfect man but with a possibility of being a psycho. Conclusion to the case is similar in some ways.

Genres: Comedy, Drama, Supernatural
Tags: Social Worker Male Lead, Gangster Male Lead, Moral Dilemma, Mafia, Child Abuse, Yakuza, Identity Swap, Body Swap

Genres: Action, Military, Historical, Comedy
Tags: Power Struggle, Sengoku Period, Oda Nobunaga, Adapted From A Manga, Time Travel, Honor Suicide, Doppelganger, Slight Romance, Hidden Personality, Deception

Genres: Mystery, Law, Drama, Fantasy
Tags: Time Travel, Fight For Justice, Death, Prosecutor Male Lead, Second Chance, Strong Male Lead, Corruption, Violence, Investigation, Bullied Male Lead

Both main characters are switched their soul accidentally because of falling and related with the moon. And the good character poorly move her soul to the body of the bad one.

In "Tengoku to Joigoku" drama, the female lead that working as police, landed her soul on the criminal body that did many crimes and hated. But in the end.. same like "Switched" drama, they have to work together to fix all the issues and switch back their soul.

Genres: Business, Comedy, Drama, Fantasy
Tags: Body Swap, Sismance, Sassy Female Lead, Smart Female Lead, Strong Female Lead, Eccentric Female Lead, Naive Female Lead, Infidelity, Revenge, Bromance

I recommend this both drama because , Male lead and Female lead
try to solve problem
In one drama explosion and another student murder/suicide

Genres: Action, Mystery, Romance, Sci-Fi
Tags: Time Travel, Death Of A Fiancé, Genius Male Lead, Attempted Murder, Fight, Death, Android, Artificial Intelligence, Robot, Murder

He Fei's wife, Li Mu Zi, disappeared mysteriously during their wedding anniversary trip. While he was searching for Mu Zi, she appeared again out of nowhere, but he insists that the strange woman in front of him is not his wife. Lawyer Chen Mai gets involved in this bizarre case, and more mysteries slowly emerge.