I really LOVED the acting!! The cast either made you really hate them, or really love them, which shows that they did their job in playing their roles. I thought the storyline was there, but it ended up missing quite a bit to it. I didn't quite understand the whole mystery shop guy turning into Eun-gyeol's mentor at the end, and the ending was also really rushed. A little disappointed that being in the past changed how their lives were in the future. It was kind of like they were saying they weren't happy with their middle-class life in a way?? Either way, my FAVORITE and I mean FAVORITE part of this series was Yi-chan and Cheong-ah's younger storyline. The actors were adorable, played their parts super well, and they were just eye grabbing ♡ I couldn't stand Se-kyung's daughter though. It seemed like they just added her for a love story with Eun-gyeol! Overall I rate this a stretched 8.5! I'd like to put it lower, but it's definitely rewatchable, thinking about all the great parts to this series.