[EDITED AFTER FINISHING THE LAST EPISODE]

I'm not sure if I'm objective on this drama because it's not really my style of drama but let's give my 2 cents anyway...

The acting is too much. The actors are probably directed in such a way that they have to act in an over-the-top manner, that gets exhausting the more you watch the drama: exaggerated facial expressions, loud exclamations, stereotypical "drag queen/trans woman" way of talking... it becomes annoying.
A slightly biased opinion: I think Joss (the original actor meant to play Prab) would have added a real something to the character, I think. Luke is alright but... I initially wanted to watch this drama for its storyline and to see Joss in this role.
However, there are some nice looks of real concern and affection in Luke's eyes when he looks at Grace and Grace does portray emotions quite well as well.

The story had potential (a super cis dude getting into the world of drag queens, a girl looking for her sister, mafia traffic.... how exciting!) but they had to make it longer than 14-16 episodes and it ruins the tension, the interest and the excitement. The last couple of episodes pick up the pace and are quite eventful and entertaining, shame we had to wait that long to get there!

Speaking about the storyline, it's a bit fuzzy and unclear.
-Why do Noona and Nadia look exactly the same? (I know they're twins but one is a transgender woman, the other is cis' so
Nadia purposely had procedures to look exactly like her sister?)
-Why is Prab acting like a trans woman (and acting like it's a ridiculous thing) when he could have easily passed as a transgender man?
-Why is Pran included in the investigation team when she's not even a cop?

Some characters are a bit too one-dimensional: Lucy is the jealous b*tch, Tanu is the "try hard to be funny" sidekick, Julia is the slightly dumb villain's minion however, Honey's character, Decha's character, and PlaToo's character were interesting and brought something, made us feel something.

I know the plot is based on secrets, misunderstanding, and double identities but the lack of communication between the two main characters ends up being problematic. Because they don't talk, and don't reveal anything to each other for a long time, they both sink into a situation that doesn't really evolve. Had they revealed their true motive or their true identity, they would have become a team that works in the same direction instead of doing things alone and there, it would have gotten exciting or thrilling. Therefore the plot drags on! (I know I said it already).