I hesitated quite a bit before watching that drama because of most reviews and critics about the ending, but I enjoyed it. It's clearly not the best drama, the plot becomes muddy at times, and after a while, it does become repetitive. BUT, the actors are amazing, and they are really selling the characters and their dynamic. The chemistry between Gil Da Ran and Kang Kyung Joon was evident for me even before the body swap. Gong Yoo was absolutely convincing as a teenager trapped in a man's body. The two main characters are cute together and the interactions with the family are lots of fun. As for the ending, I actually liked it. I like open endings and the fact that you could project whatever you wanted in it suited me quite well, but if you like clear defined endings, it will be beyond frustrating. (okay, it probably deserve less than a nine even if I loved watching it, but considering how bad other reviews are, I'll leave it at that)