The ending was shit but it was such a good drama from ep 2 to 14 because I absolutely enjoyed all the scenes between Song Joongki and Lee Sung Min, their chemistry is chef-kiss.
I loved this show until the last 4 episodes... I feel that they kind of dragged it out when it could have ended by episode 30 or something. I don't dislike the ending but i don't like the ending as well, i feel that they could have ended it better with more explanation and stuff. But it was still a great drama nonetheless and i really enjoyed the whole series (up till episode 30) where it was intensely good, well-paced and filled with thrills & plot twists.