This drama is a must watch....There are many scene's which are just awesome that u will watch it again n again .... But I don't like the ending, although it's a happy ending but it's not complete for me cuz they show that Lee Gon and Jeong Tae-ul keep roaming around the universe (even they show a glimpse of their old age hands holding together while roaming... So I guess that means they will continue to roam till they get old) and that's what I don't like cuz Lee Gon is the King of Corea so that's why he should have a queen and the Heir of kingdom Corea not like wandering around the universe and discovering different time period with his girlfriend 🙄..... But despite of it's ending story line, overall drama is amazing it's has time paradox, superiority, a pinch of romance and everything you need to watch....