Premise was great, execution was meh. I really liked the three main actors; Park Sung Wong as the pampered action star Woong Gwang was excellent, and the bromance between him and agent K (played by the very suave Park Hai Jin) was pretty funny. Kim Min Jung as Cha Do Ha was endearing as a fan turned confidante with the older action star, who came off as kind of a father figure. But Agent K was a terrible spy, with pretty much everyone on to his spy status, but tromping in and out of his spy hideout, the whole secret agent idea did not seem very secret.
The romance between Agent K and Do Ha fell flat as well. As many reviews have stated, there was very little chemistry between K and Do Ha, and the rationale for the romance was kind of flimsy. I think it would have been good to lean further into her conman upbringing and her suspicions of Agent K. He apparently used romantic entanglements with gullible women to achieve previous missions; Do Ha's street smarts and quick wit should set her apart and explain his attraction to her.
I dropped it because the plot was getting very repetitive. The spy missions were not that intriguing and I lost interest by the third mission.
Individually, I did enjoy the three main actors and hope to see them in other roles.