First let me fix something from the synopsis:
the lord himself isn't THE BUG! at first I started it thinking he is the bug that should be eliminated! but he has his story line in game and is one of the game characters. It's just that the bug affects him!
to fix the bug, he needs to get poisoned 100 times.

The acting is good and the leads have good chemistry.
The costumes are pretty. I like the comedy as well.
My foodie heart is also happy with the food they showed every time, so you can also watch it if you like food dramas.

tbh I didn't notice the ost much but it was okay I guess.

this drama is one of those you wished were longer! The ending was a bit rushed and not actually what I wished for but they did what they could with the time they had.
I wish they did proper adjustments for the ending to make more sense, instead of acting like "entering game equals time travel", cause it's not same.

Despite my complaints about the ending I will re-watch this in future.
It's an enjoyable watch. I recommend it.