I'll keep it short - this drama is a gem.

10/10, binge watched it in one go (good thing I had next day free XD), it's that good - got me hooked with 1st ep and kept me going to each next episode because the mystery/process of it & the plot and how it will unravel kept my interest 100%

Excellent writing and execution.
Not everything needs an explanation, but what does need to be found out, will be.

Also, an excellent example of how not to judge a book by it's cover, the damage a single person can cause and the suffering of loved ones due to other's & society's uncaring & cruel attitude.
I'd almost say this is a slice of life because it sure does showcase a lot of the bad & good of our society and one can learn to be a better person.
I'm already ready for a re-watch.