This drama is PERFECT. Honestly so underrated domestically and internationally.
If you're looking for a K-drama that has plot twists in every episode, this is what you're looking for. There's always a plot twist from the first to the last episode, and trust me you can never predict them. A perfect mix of mystery, thriller, action and a sprinkle of romance. The Main Characters are also not dumb, they are also the perfect mix.
If you're worried of an unsatisfying ending, Im already saying that it is very satisfying. It wasn't overly joyful, but hence just what the characters really deserved.
And also, it is conveniently short and straight to the point. No side plots or anything, each second is important to the story. Which is very convenient to people who got not much time as there are only 12 episodes with roughly an hour each.
This should definitely be in your watchlist. The best kdrama I must say.