The drama is about a 18 year old guy gets stuck in an 30 years old body. The story sound interesting and this drama was made by Hong Sisters which have created many great dramas. Big is not one of their best creation. The comedy was great but I wished we had gotten to know Youngjae and Kang Kyung Joon a bit more before the body change It had made it easier to relate to the drama and the characters. but since almost everything happening in the first episode there was no time for that. which resulted in the later half of the drama feel slow and confusing. It made me think that they didn't really plan the drama well enough. after the 12th episode there wasn't a lot more to ad onto the drama plot wise so they dragged the melodrama out until the last 20 minutes of the final episode. I do honestly like the characters and the acting was great but the story was handled badly and a complected plot met an easy ending. I would watch the first two episodes again but not further. If you want to see a drama without getting the feeling of disappointment I do not recommend this drama, watch on your own risk.