This is based on a web cartoon, and perhaps if I could read Korean and had read that cartoon I might understand it a bit more. Set in the world of a fantasy game developer, a rich guy forces his way into the game company to save his younger otaku and cosplay fixated younger sister. It's quite watchable and inventive without being readily comprehensible to me.

There's overt references to the Choon Hyang drama (which the Hong Sisters based their first drama on).

Appropriately for a drama based on a web cartoon this was a web drama - judging by it they are very fast paced to the point of incoherence.