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Both are remakes of Cantonese movie "Infernal Affairs" - City of Damnation is an official remake, and The New World was only inspired by it - the plot doesn't follow the original script

Both movies were directed by Park Hoon Jung - while they don't share many similarities in plot, they have the same vibe

Male leads in both movies enter gangland as undercover cops and befriend their criminal co-workers. Both productions have a similar plot - unfortunately I cannot reveal more without spoiling either of these films. If you liked one of them, you'll likely enjoy the other one too

One of subplots is rather similar - "fake" (grand}sons taking care of their "fake" old (grand)mothers with Alzheimer's

Similar premise - MLs in both productions get transported back in time but ML in Don't Touch me, Your Majesty keeps his male body.

Both shows are similar horror anthology web dramas that sometimes deal with controversial subjects.

Both shows have the same main cast and were made by the same screenwriter-director duo (Fatball and 25) making them look almost like spin-offs or remakes

While the plot for both shows isn't that similar, they use the same way of storytelling where each major event is shown from different POVs that complement each other

Similar vibe and plot - a group of lonely people bonds together after they get involved with each other because of money-related crime

First story in the 76 horror bookstore anthology has a similar premise to Strangers from Hell - lead charscter moves to the city to earn a living but ends up renting a room in a shady place where inexplicable things start to happen.

Both movies are directed and written by the same person - Arvin Chen, star Jack Yao as ML and have a similar night-time Taipei feeling to them. While Mei is a short film, Au Revoir Taipei is a more fleshed out feature film that also focuses more on comedic aspect.

Both these shows have a similar premise -both dramas involve two friends-detectives investigating cases.