First few episodes made me doubtful and I was thinking about dropping this drama, but I'm glad I didn't do that and chose to watch further. The actors were amazing and the soundtrack was strong, it kept me going.
The strong meaning of the main idea was portraid so beautifully and interesting. The relationships between son and father, grandmother and grandson were so important and pure and growing connection between father and daughter made me happy.
Although ending still left so many question, that I tried find the answers online, little details that were shown answered some of them. The last episode made me weep, it was so emotional and strong. This is by far the best Kdrama I had ever seen. I wish I could watch this drama again as new.