[Advent Drama Calendar 2020] Day 21: Which secondary character stole the show from the protagonist?

I'm not sure if it's "stole" per se, or rather equally engaging.

1. Teddy Jung (Team Bulldog: Off-Duty Investigation, 2020) - along with his two henchpeople^^

2. Yu Minhyeok (Alice, 2020)

Drama did him dirty and whoever OK-ed this series should have their license revoked.

 

Honorable mentions:

All kitties that appeared in any drama I finished (or dropped) in 2020, but I don't remember except for:

Kill It (2019)

When I was the Most Beautiful (2020)