It stars the incredible Shin Eun Soo; has a high school setting; and the Shin Eun Soo character has a very dysfunctional family.

Both are anthologies. Both have characters and plots and overlap. Both are heartfelt and bittersweet.

Both explore the idea of time loops and how they can or cannot change someone's fate, although Extraordinary You approaches the idea from a more deeply rooted philosophical point of view (Martin Heidegger's theories of being and time and being-in-the-world).

Also, both have high school settings and filmed scenes at the campus of Seoul's Yonsei University, featuring the distinctive Underwood Hall as the entrance to the high school.

They are both BL /yaoi parodies. Both are hilarious and both are totally rewatchable. The actors know how to play the humor and do the parody in an affectionate way. Also, both have short formats.

The fantastic (not to mention hunky and gorgeous) Jason Tauh has a main role in both of these Taiwanese series!

Both star Adam Lin and Huang Guan Zhi. In 5 Lessons in Happiness: Little Man they play a budding couple. In Komorebi, as different characters, they play a married couple.