The part where Gyu Man said "You think you're the only one that's lonely?" in the last ep was quite heartbreaking. That one part made me really sad. Also when he got "disowned" by his dad. He was the only person that he respected and needed.. Nam Il Ho crying after hearing about his death was quite sad too.. Although Gyu Man was the villain and of course we all despise what he did, there's a part of me that pities him a lot and feels like there was a reason that made him like that..