Although one of them is a BL, they both deal with a main character that has seemingly gone to the dark side and both have time jumps.

Both dramas are BLs that deal with men who are thrown into a different reality.
Both dramas focus on the comedy and romantic aspects instead of the science behind it.

Although both dramas have a completely different story and vibe, they both deal with what can happen when people don't conform to their gender.

Both dramas have a ruling father who makes his three sons compete against each other over the throne, but then doesn't understand why they are trying to kill each other. In both dramas one of the sons pretends to be dumb and weak to blindside everyone.

Same author, similar themes.
Same kind of team work in law enforcement.
Both have a gritty urban atmosphere.
Both have a friendship/romance/bromance that tries to survive in a world full of inner and outer conflicts.

They both have similar themes of a women trying to progress in a competitive and male dominated industry, both have a mentor ML (although in very different ways) and a slight romance that isn't the main focus.

Both dramas focus on the lives and loves of different airport personnel. NF teaches more about the different jobs in an airport, while FTY deals more with the inner politics behind the scenes, but both are full of beautiful people and majestic aircrafts.

Both dramas are about women from the big city moving/returning to a small town. Meet Yourself has a lighter tone, but both focus on family relationships, generation gaps and the challenges these small and remote towns are facing, trying to keep up with a big and modern world.

In both dramas Wang Kai plays the tough older boss/mentor/love interest of a younger woman, although the setting is a bit different.

The aspect of characters having to adjust to living in a sort of parallel world is very similar, and they both have a mostly cute vibe.

The bickering and loving friendship between the two MLs has a similar vibe, plus the aspect of mystery.

Although the setting is different, both dramas have the bickering and gradual romance between an older mentor and his younger apprentice.