The understated way the story unfolds and the pacing make this an enjoyable and funny movie. Body switch movies have been done many times but they are often slapstick or painful at times. This manages to avoid that. The touching back story and how both their lives improve is meaningful. Both the actors do a good job when in the other person's body. It's not a laugh a minute but there are quite a few laugh out loud moments and lots of feel good moments exciting fighting and well handled complex relationships between the parties.

The dude inside me was funny. I enjoyed the pace and the way they presented the story. I also love Jung Jin Young in this one and he proved to be a great actor.

However, the scenes with the mother and her ex boyfriend in the body of the young student, although laughable, were a bit off, as it wasn't easy to sympathize and actually imagine that the one talking was not the young student but the mafia boss. However, Jin Young played those scenes masterfully.

Overall, the movie was funny and it had a nice conclusion, as well as good performances.

So, seven out of ten.

The body swap idea has been done before ("Luck Key" comes to mind),so while the story is not really original, it's still a funny movie. The greatest part is the total character change of the fat and shy highschool loser after having absorbed the gangster boss' personality. Really shows that even a fat kid with thick rimmed glasses can be a total alpha male when he carries himself that way. Absolutely hilarous. The movie is kind of stupid and childish at times and it could have been 15 minutes shorter, but ultimately I enjoyed it and had quite a few good laughs.