All I can say is that I'm too confused with everything. I tried to understand what happened in the past. Cha Soo Hyuk's father was abusive to his mother and on the first chance he took her away to hide her? Then his mother found another man and that man had a son, Lee Yoon Dae, and they lived all together for some time but then they ended things between them? And why did the son not follow his father? We get no detail over Lee Yoon Dae past life. As it seems he felt Cha Soo Hyuk as his new family, his home, his safe space. That's why he was coming back. And Cha Soo Hyuk was always worried and tried to support him in each way. While he himself trapped in a mindset of "i have to take care of my broken family" when none of these should've been his concerns. And in the end what was that? What I got is that Lee Yoon Dae finally stood on his own feet to prove that he's worthy of Cha Soo Hyuk's time and feelings. That he found his way of living and faced real life without standing still anymore.