It is a fun and entertaining drama. I would say the set up and first half of the drama is very entertaining and comedic. Some may consider the female lead to be somewhat of a wet blanket, but for me it's tolerable that I can accept her and still root for her. Additionally, I think Lee Min-jung does well in making her character likeable despite this. Gong Yoo is so funny and entertaining in this drama. His versatility is really on display here in how he is able exude different auras for essentially polar opposite characters with the same face. I think the drama starts to lose itself in trying to rectify the tricky circumstances it set itself up in. Of course, the whole idea is that the soul in the body of this adult man is actually a teenager, so the possibility of having the female lead end up with him is difficult. The romance between the two leads definitely got convoluted in how they would get their "happy ending" because of this. Lee Min-jung and Gong Yoo's chemistry is *chef's kiss*. There's just something about this drama that I just really love because for the most part, it's funny and entertaining.