Both ML are Taxi drivers
Although both dramas are completely different they have comedy and suspense in IT

Both are fantasy themed dramas about male lead being creature from different world - god and grim reaper and human female lead.

Both are fantasy themed dramas about male lead being creature from different world - gods and human female lead.

Both dramas are romantic comedies about creatures from different world who finds themselves in modern era

Romantic comedies about ML that are creatures from different world who finds themselves in body of immortal human to finish their mission.

In both TvN dramas is ML well known idol and female lead is obsessed and stalking ML
Both are romantic comedies

Both main protagonists suffering from cancer can make contract with "devil" to get extra time to life. In If Cats Disappeared From the World can postman erase one thing from the world and then get extra day to life. In Doom at Your Service Tak Dong Kyung makes a contract with Myeol Mang for a hundred days to live how she wants, risking her everything.

both are really crazy makjangs with crazy plot, adults, rich people and stuff happening around them

Mature protagonists (adults)
Infidelity of partners
Parents behaviour affects their childrens
Greed for connections to social elite, power and money

Both TvN dramas are based on the webtoon.
They're about girls that are not popular at school, both are comedies and have rich male leads. Both contains social problems, bullying, misunderstandings and betrayals.

Both have the concept of the frugal FL teaching her way of life to the ML after the ML lands in trouble for his way of spending money

They both deal about possession and evil spirits and the fight against them. They both have the exact same feeling.