First of all let me start by saying that I was waiting each week for new episodes and I don't really watch weekly shows, this show was gripping, tense and entertaining. This show answers the question to basically "If I had privilege and knew the future what would happen" in a realistic way.

Its smartly written, characters are interesting and it never derailed from the main story with romance or comedy. I loved it. It handles family relationships in a great way as well, I loved the relationship between the MC and the grandfather, it was such a journey. I think it has to be one of my favourite relationships in any kdrama.

I think the chairman grandfather Jin Yang-choel (played by Lee Sung-min) carries the show, yes Song Joong-ki is amazing and the MC but every scene that Lee was in I was amazed. I hope he gets a few awards for his performance cause he's the MVP of this show for me.

Last episode is interesting, I will not spoil it but its interesting. I'd say don't read any reviews that mentions anything that happens in the last episode, just skip it.

I'd recommend this series to easily anyone who enjoys serious shows.