Everybody can't stop bashing on the drama. Guys, make your own advice and watch the drama, then if you don't like it, drop it. But don't ask people to not watch it.

For me, The drama was fine. An advanced reincarnation's concept. (similar to Goblin)
It's about :
-strong love
-jealousy,
- memories,
-hard life conditions,
- how far people are ready to go to be rich, why being rich ?
- travel , time travel,
-adventures
- work's life, work's motivation..
-and to love forever

The drama is so rich ! How can you hate it that much. Yea, I agree , the drama don't deserve a 8/10 but at least a 7/10. It's not honest to give it a 1/10 or 3.
The show started strong ! But was finally slow, sometimes complicated. The characters were well done ! Shin Se Kyung improve a lot, her chemisty with Kim Rae Won was not a joke.

The end was pretty interesting, he choose to live forever to keep her with him. I really loved the end.
As Goblin the drama was about Love through the time , and the Ost were pretty good !