Perfection. Lee Joon Gi's acting got me shaking the entire time and my goddess IU never dissapoint. Their chemistry together was god tier and the whole story it self definitely got me permanently traumatized. Best production and best romance/fantasy/historical drama ever made in korean history. Literally every character deserved better and highlights to emotional/crying scenes and amazing character development. Definitely a must watch and a must love drama. If you don't start now, you will regret later.