Both dramas start off by one of the main characters moving from a big city to a town for work. At the beginning of both dramas, the main leads meet several times because one of them has multiple jobs, which is something that confuses the other. In both shows, the characters' relationship doesn't start off too positively.
Both dramas are about people infected by an illness that is compared to rabies. In Search, the main characters are in the military, while in Happiness the male lead is a police officer and the female lead is a member of a special operations unit. In both dramas, in between the more intense thriller-like moments there are some lighthearted scenes as well.
Another fusion sageuk with a great cast. Its similar point is not only the comedy, but also an interesting play on the stereotypical gender roles: Homme Fatale has a "feminine" male lead and Mr Queen's female lead is "manly". Both titles combine comedy with more serious undertones.
Phoenix is the original story that Phoenix 2020 is based on. A lot of the characters have been kept from the original story, and its main themes are the same, therefore you can watch and compare the similarities and differences of these two dramas.
While When I Was the Most Beautiful is not a revenge drama, quite a few of its aspects reminded me of A Love To Kill. Both dramas have a very beautiful cinematography. They also have a very similar main theme -- they both tell a story about two brothers who fall in love with the same woman. Both are emotional and a bit slow-paced, so I think if you enjoyed one, you might enjoy the other, too.
Both dramas have a strong focus on the entertainment world, its good and bad sides, as well as human relationships. Both stories have a slice of life vibe.
Both are romantic + fantasy dramas, and their stories are about an angel who saves a human and ends up coming to live in the human world. Also, in both dramas the starring male leads are members of INFINITE, so both dramas are definitely must-watch for Inspirits!
Both dramas give me similar vibes, as they are about corrupted schools where the students have to deal with unfair treatment and discrimination because of their status. Just like in School 2017, there are a couple of teachers in My Strange Hero that are willing to help, fight and stand up for their students against the unfairness.