There have been so many time-travel movies and TV shows in recent decades, and that has made the subject matter feel exhausted and sometimes downright boring. It is so hard to recycle an idea and present in a way that is creative and does not fall into the traps of all the previous cliched plot lines. This one is a gem. The storyline is well thought-out so that it doesn't have some silly plot holes. The cinematography is lovely, as is the set is magical. The best part is the acting by both young and old actors. Shin Eun-Soo and Lee Hyo-Je were so natural, esp. in the scenes where it might even make adults act awkwardly. Later on, Kang Dong-Wan and Shin Eun-Soo acted with such ease around one another, as if they really had known each other all their lives. It's a moving story about friendship, loyalty and having faith in people. I re-watch this movie once every couple of years just to relive the magic.