Absolutely the best drama I have seen in every aspect:
- perfect pacing
- interesting and engaging plots
- excellent acting
- great chemistry between two main leads
- amazing delivery of the complex character (XW) by the actor
- all the actors/actresses did great job, they all suited their roles
- the ending is very satisfacory and makes the journey of 38 episodes that more precious and worth it
- the music is beautiful and suits the drama so well
- the actions scenes all look very well

This is the very first time the entire show stole my heart.