For one, I'm really happy that the author makes the gender bender concept work. Although it's not like the premise is realistic, you won't be thinking it's unrealistic because the story and character behavior is well-executed. You're not working hard to suspend your disbelief; the artful execution of the manwha suspends it for you. That's really a key indicator of success for me!
To describe it, well, the feel is a little hard to describe. It's suspense and character emotion. I don't want to say it's dark, because the mood is not as heavy as the word might construe, but drama and reliance on characters' stories creates a tinge of emotion. And it's dramatic; you'll be pulled in and wondering what happens next and how the pieces of the backstory fits together.
There is a lot of romance tension and triangles, and if were any less well-executed, it would seem scoffable or too heavy. But it's not, so the romance pulls you along. It's good.
