The acting the ost everything was a complete masterpiece jis sung was just incredible thw wya he played the garter showed his talent as an actor the support characters were amazing and aswell and ji sung chemistry hwang Jung rum was amazing aswell her character was very well written definitely....... One of the ebts drams I have ever watched park seo jeon played na amazing support role aswell an dthe music was Great aswell...... Story was very well written though they were a bit too many flashback but plot buoy up very well and shin se gi was so good his personality was so thoughtfully created by it was amazing to watch how he change through out the story how he learned to trust his other self