Strong storytelling, i love how they put all the pieces together and slowly develop the characters. It make the audience emerging with protagonists. The emotional engagement is absolutely beautiful. The order, the pace, the acting are meticulous. I would rate 12/10. I never watch any drama or movie with this kind of theme, the bromance, the love they have for each other are just really touching. I can put myself into their shoes by watching this whole series. Fabulous. Everyone acting skills are on point, especially KimSooHyun(main male cast), OhJungSe(the brother) and ParkGyuYoung are particularly good. I am totally astonished by it. I never expect they can be that good, all the tiny details and facial expressions are excellent. All the characters are really realistic, very 3d, the dilemma in life, the selfishness, the conflicts, what they experience shape who they are, their personality, their identities. The interactions and conversations between characters are interesting to watch.