OPM

This starts off very strong, the story is actually quite dark and handles some heavy topics decently.
The leads are definitely the focus and their acting is great.

The concept is interesting, and i was looking forward to how it played out and how the characters developed.

However as far i watched, they don't develop or grow. ML is all powerful, and FL is weak slacker. They each take turns getting hurt, rescuing each other and end up in an intimate embrace. Repeat.

FL has the grandmaster as her mentor, and yet true to her motto, just slacks off from beginning to mid point, no motivation to develop her skills even though she repeatly gets hurt. While entertaining at the start, this is quite dull by midway.

Don't get me wrong, the scenes are great. However theres no balance, there's no growth. The Centuries Old Snake with a mindset of a child is annoying too. Not sure if it gets better as i am dropping this.

If all you are after is intimate Romantic scenes sucking face between the leads, then this drama is perfect for you.
Every scenario is to setup for a Romance scene. Haha. Perhaps this is why the drama is rated so high?