The plot seemed promising, but the chaotic writing ruined the potential of this drama, in my opinion. The dark plotline with the serial kidnapper didn't fit in with the rest of the drama at all. It made the whole thing too messy, giving a weird feeling to the viewer, instead of completely pulling them into the story .
The cute moments sometimes seemed like they were coming out of nowhere, which made the blossoming of the romance feel a bit out of place. That was made worse by the love triangle, that was installed, but barely used (waaaaeee?)
By focusing on too many  plotlines with very different genres, the writers made it difficult to get into the story and I ended up finishing the drama by skipping most of the scenes.

I was also really annoyed by the underlying homophobia in this drama. I understand that homosexuality is a taboo subject in Korea and LGBT people aren't easily accepted by their peers yet. But I found the lame jokes and ridiculous portrayal of gay men simply embarassing to watch (and not funny at all).

The competitive relationship between the male leads  was fun to watch, but the love triangle was forgotten quite quickly, as Gook Doo got absorbed in the "crazy criminal" plotline.
The setting of the drama got me really excited at first (Ainsoft / video game making), but it didn't add much to the story in the end, which wasalso a bit of a waste.

All that being said, I thought the two leads were really cute and I did enjoy their scenes together (lots of fluff!). They made a really lovely couple and their cuteness is what made me finish the drama, even though I wanted to drop it.

Basically, I believe this drama could have been a great rom/com, if the numerous plotlines and inconsistency in the story hadn't messed it up. If you love cheesy romance and don't mind the messy writing / not always tasteful humour, you'll probably enjoy it.