Just because you forgive someone doesn't mean you'll forget what they had done. Just because su won make a good leader doesn't mean he's a good person as a individual. Yes, it shows he's human as well but doesn't justify the killing and betrayal. I hope they all have a good ending especially, hak and Yona together. At the end of the day, all of three were once friends deep down it's still feeling towards one another.
Kuro shows his feeling toward different. There are alit of ppl like kuro who don't anything about liking/love until they experience it. There was mulitple of times he showed he care and liked her because of his actions and when she communicate with him. He started understand her more. The memory loss is bullshit honestly. The black hair gurl have no chance at all but kuro not going to give up on her