Mesmerizing! A story of four people and how they've loved each other across time. These are not your typical love stories either. They're unique and moving and passionate! The actors abound in great depth. They have to, playing so many different characters across history. The flashbacks are done like individual movies, I think I could go back and watch those anytime. You won't see where this is going until the end, which has a surprising amount of subtlety for the Kdrama world. It's worth it.