A good enough drama with twists that even happen till the last episode. The love story was strong, with the friendship overpowering the romance though, which isn't necessary a bad thing. The friendship dynamics actually were pretty good, as well as the chemistry between the actors and the couples. The side story was interesting as well. The martial arts theme was entertaining, moreover. The action scenes were presented really well and looked original and real life and not badly made, so that gave the drama a boost. The past mysteries, in addition, were interesting, but not that thrilling, as they were kind of odd and even if they weren't added, the story would have been the same. Finally, the performances were good as well.