Both are quiet films that depict their main character's romantic relationship as it was, without sentimentality. Both movies can be boring and pointless for some, but the top-notch acting from their leading actors (Moon So-ri in Sa Kwa and Han Seok-kyu in Solace) made them watchable.
Dramas about friendship, first love, and young adults trying to figure things out. The male lead in both dramas had an air of melancholy and maturity beyond their years.
Both are about ordinary people trying to live their life in the work place. You might even call them dramas about (among other things) office politics; it's just that Life took place in a hospital and Incomplete Life in a trading company.
Both are about an older man and a younger woman who, through their shared connection, learn to work out their personal hurdles and become a better person.
Both were adaptation of the works of mangaka Shimamoto Kazuhiko. Both were strangely fun and compelling in spite (or because?) of over-the-top acting.
Comedic take on human-alien/zombie encounter, where the aliens/zombies come across as sad and pathetic rather than menacing.
Both are about criminals who take themselves too seriously (for better or worse!)
Both are about people making friends and connection, with a main character who is introvert and unsociable.
Even though the two dramas have very different feel to them, they both revolve around the same topic--desire, and how what you want might not be what you think it is.
The main character in both dramas seeks to uncover the truth behind a suspected bullying case
They're both about a schoolgirl who inadvertently joins a predominantly-male extracurricular club.
In both movies, you see a character who loses his humanity little by little.