This is a very good fantasy mystery sci-fi drama! The viewer gets to enjoy a stunning cinematography, wonderful cast and a mesmerizing soundtrack to counteract two things on which the drama fall deficient- Gu Chan-seong and his relationship with Jang Man-wol, and the dual timelines. Gu Chan-seong is just a catalyst for Jang Man-wol’s character when it could have been so much more given the fact that he was always the person who loved her the most, and still, the writers couldn’t entirely fuse the love story into the complex and strong Jang Man-wol character ultimately resorting to a sweet and soulful romance, a disappointment when you have actors of high caliber as Lee Ji-eun (IU) and Yeo Jin-goo. The drama’s focal point is Jang Man Weol and Lee Ji-eun (IU) delivers an excellent performance bringing this character to life. The rest of the cast become an extension to her character delivering a sweet romance, thrill, drama, and comedic moments to her emotionally laden persona. The second deficiency on this show is the merging of timelines, past and present. The plot could have been better if only the present timeline would have the same important development as the past, but it fell short in comparison. Even though the drama is not perfect, it is entertaining and fun to watch. Enjoy it!