
He's fake, he's using people, he hasn't tried to understand why Hee-ryang did what he did, or who is really to blame. I hate these kind of people that's focused on just one thing (in this case revenge) and who doesn't look at the big picture.
He's family was killed. Yes. But why? If it was me
I would've like to know why. Why did it happen? It's so much that Yeonjo doesn't know. And I can't for the life of me understand why he doesn't want to know.

I think you have to give him a chance and understand him more.
Hee-ryang killed all his family because the king accused his father of treachery and He's not using people, when he was in need and asked the first top for help the top asked for his "body" in exchange.
He was never treated right since his family's y passing.

I don't remember if Yeonjo ever talked about the king or how much he knows about what was going on between the different clans. It's annoying that he has no interest in that, just in revenge.
And what I mean that he uses ppl is the fact that he befriended the prostitute just so he could use him.
I think Yeonjo is capable of doing the same thing as Hee-ryang if Yeonjo was in his place. They are really alike.
He perhaps got bad luck, but he deserves it. I really can't stand him.