I watched this because It's been added to Netflix (under the name "Never Die" ) and it was short. It's a cute story, basically Se Yeon discovered 200 years ago that she was immortal after falling in a well. Now every night her body "resets" itself and gets rid of any illnesses, injuries, and even hair cuts.
Jung Hoon and Se Yeon meet after she saves him form an accident and dies, Jung Hoon pays for her funeral only to discover she has come back to life.
It's a very short drama- about in hour in total- so it's very easy to watch on a lazy afternoon. The acting wasn't Oscar worthy, and it was cheesy in places (but that's to be be expected from a drama with this plot), but all in all it wasn't bad. I really liked Ji Eun Sung, I thought he was very cute and played his character well. Kim Yun Bae's character also made me laugh, I look forward to seeing him do more.
My only fault with the drama was the ending, it would have been better with a "bitter sweet" ending (to quote green_tokki in the comments).