If you prefer realistic stories, or feel that no self-respecting woman should ever waste her time with sketchy relationships, or give a guy multiple chances to redeem himself (despite however attracted she may be), then this probably isn't going to be your cup of tea. On the other hand, if you are a fan of the human experience, and enjoy watching flawed characters grow and discover themselves (and each other), or if you just love a good old "enemies to lovers" plot, then you're in luck!
Despite the rather heavy nature of the subject matter (psychological issues & treatment), the actual story execution is by contrast quite light, sprinkled with plenty of comic relief. Han YeSeul's sassy and determined character was especially endearing, and I found the whole 'revenge and counter-revenge', and the "I know, but I can't let him know that I know...." and "she doesn't know anything...does she?" dynamic between her and Sung Joon to be just hilarious!
Of course, there are also plenty of flaws. The psychology/treatment aspects are oversimplified, and the "experiment" was handled in a ridiculously unprofessional manner. But since they are basically just foils for the larger romantic plot, I personally found these shortcomings forgivable. Additionally, this film relies heavily on secrets and ambiguity between the couple for much of it's humor. If you don't like frenemies who would rather pussy foot around with verbal sparring, rather than just clearly state their feelings up front, then you will likely find this story quite tedious.
ROMANCE RATING: * * * 7.5/10
With 8+ longer kissing scenes, there's plenty of romantic contact for thirsty viewers. However, I personally could have wished for a bit more "buy in" between SJ and HSY. The kisses were there, but they didn't really make my heart race or draw me in (though it could have also been an issue of how they were shot). And sadly, I just couldn't buy the chemistry between HSE and LJH. But all in all, it was still a fun watch.
