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Both revolve around a person infiltrating a wealthy, seemingly perfect family, and then bad stuff starts to happen to this family.

In both drama, students are forced to play a death game. Eerie and suspensful setting.

In both dramas, a group of children experience trauma in "welfare centers" and grow up carrying the scars into adulthood. Years later, a series of inexplicable murders begins to unfold, forcing them to confront the past they thought they had buried.

Both stories are filled with secrets, deeply hidden, slowly revealed, and always more complex than they seem.

Each drama is masterfully crafted, especially when it comes to plot twists. Just when you think you've identified the culprit, the narrative shifts and turns everything upside down.

If you enjoy dark mysteries with layered characters and psychological depth, these two are excellent companion watches.

They are both thrillers featuring male twins as the main characters.
In both shows, there is a "good" twin and a "bad" twin who fight each other.

Both dramas are stories of revenge related to childhood trauma. In both, the main character is a mastermind and a manipulative person who will use anything to achieve their goals. Both are also very dark.

Same vibe. While the story isn’t exactly the same, it is somewhat similar. Both share very dark tones. In each, the female lead is involved in a "justified" but violent crime as a child, and the male lead is completely devoted to her. Together, they grow together and descend deeper and deeper into committing horrible acts, ultimately destroying themselves completely.

Byakuyako has a very memorable OST, probably one of.the best of the genre.

In both drama, a judge is forced to cover up the truth after his son causes a hit-and-run accident.

Both are intense thriller happening in a high speed train that cannot stop.
- In Train to Busan, it is due to a Zombie outbreak.
- in Bullet Train Explosion, it is due to a bomb that will explode if the train goes below 100 km/h.

Chinese thriller drama with time loop and mystery
- Reset happens in a bus
- Cycle of Terror happens in an elevator

Relationship between a female lead and a failed idol.

In both dramas, one of the main leads lives with an abusive parent.

Both stories focus on a special relationship between two male students (although Miseinen is BL, while High School: Return of a Gangster is a bromance).

Both films focus on an older boy taking care of a younger child.

Both feature kids abandoned by their parents and forced to survive alone.

In Nobody Knows, a mother of three kids leaves the house and never comes back. The children must live alone under the supervision of the older brother.

In Stand by Me, a homeless boy meets a homeless child and begins to take care of him.

Both films have a similar vibe.

Both are sad, emotional movies with superb acting.