I was waiting for a modern action drama involving spies/agents/killers. I haven't seen one in so long and I feel like there aren't enough compared to how many romance dramas there are. I can only think of K2, Healer, and City Hunter that kind of had this similar overall feel. I really like the characters that are portrayed in the drama. Jang Ki Yong, the male lead, has this quiet confidence around him that just screams "I can kill you without trying". I do also like the interaction between both leads. They have the expressions of people who have been through crap and have seen it all and I feel like they see/feel that in each other without even realizing, which is why I find their interactions totally unique but also fitting.