Well maybe because I already read the novel but what I really like from this is how jin woo so different now.
The way he carry himself now show that he's aware of his strength, status and his worth.
Back then he might not yield to other, but he surely not the one to push his reason and objective into other.
To me, his big turning point is when he wonder to help Japan or not. He going there show his will and objective going forward. But back then ppl are wondering what so important about his decision. LOL.