I started this show on a whim and binge watched it over several days, and do not regret it at all. It was not-at-all what I expected: I expected a simple romance story with a twist where the female lead was in a coma for several years. Instead, what I got was a story about the importance of family and friends and overcoming adversity through shared experiences and love. The characters were all so-unique and likeable: "Jennifer" was one of my favorites, initially seeming to be just a funny, robot-like side-character, but actually hiding sage wisdom and shared pain. I loved both the young and older versions of the main leads: Shin Hye Sun killed it pretending to be a 17-year-old trapped in the body of a 30-year-old, but I also enjoyed Park Si Eun's portrayal of the young Seo Ri. Yang Se Jong's stiltedness was really fitting for being a socially inept human being. The other side characters were fantastic: Yoo Chan was an endearing nephew who simultaneously emotionally supported the lead characters and also had you rooting for him at every turn.

I felt this show utilized its run-time very well - during the ending half of the show, I felt like the screenwriter had planned plot threads from the very beginning and the plot threads wrapped up in ways that didn't have me feeling like it was a last-minute-completely-rushing ending, as some other dramas suffer from. In other words, I felt it had a complete beginning, middle, and end, which is no small feat for Kdramas, where many feel contrived in its conclusion.

I feel like there is not much more to say -- this is worth a watch.