Honestly the story was predictable with its betrayal, decieve, death of a beloved character and all.
It's just the like a typical "lead living two lives to revenge for the loss of a beloved ending with the loss of another" and therefore making them lose morality but with gender reversal.
As usual actors are amazing with their work.. Except the mafia boss who looks like he's sleep-talking.
Music is addicting that sucks in the audience into the scenes.
Personally I felt that the protagonist lacked a character development and her pair with her senior looked like one sided with him showing all the emotions and her painfully lacking and their love story felt more rushed into to complete the plot than well-thought.
That's it. The drama being short saved all the trouble... And i guess we'll have another season?!