Thinking about that scene in episode 15 after Dongsik and Joowon interrogated lcj and Joowon calls Hyuk to check where Jeongje is. Thinking specifically about how Dongsik asks who Joowon called and how Joowon describes Hyuk as "someone a lot like hkh / like a son to hkh".
I think it's such a compact yet perfect showcase of the ways Joowon detests what Hyuk stands for yet also can't let him go. He describes Hyuk as the likeliness of the man they're trying to take down and at the same time he still has Hyuk on speed dial to ask him for help the whole way through. It's brilliant