I used to see its trailer way back before but I dont find it interesting at all, but then he had his cameo in Crash Landing on you as his character as Bang Dong Gu I got confused of this movie. So, I decided to watched it and I was surprised that this movie is really amazing. There are lots of funny moments and great action scenes and the heartbreaking ending. The story is one of a kind and very touching. Kim Soo Hyun is super great in this movie. I super love the action scene very precise. Now I know why he had a cameo Crash Landing On You.