I'm on Hak's side, because I think Soo-won is not fair on toying with Yona's fates as if he's remaking them in his own hands. It's not like Yona is a degenerate that couldn't feel other's pain. Don't say you don't have a choice, he did have choices but to choose the bad path only. For example, Soo-won could advise Il to send her to Awa to befriend Lili to see her own kingdom, make her interested in medicines or politics, etc. At that time period when Yona was still in love with him, I think she will listen to him. I shudder to think to let Soo-won pretend to marry Yona and then abdicate the throne to her. He doesn't need to kill Il only for the sake of saving the Kingdom. Was it to save the Kingdom or your pride?