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Take Kang Too Jee, one of the best fighters in the Gi Sang Area, and Woo Soo Choi, a geek who loves studying and has great concentration and perserverance, and mix them up together with a really GREEDY scientists who runs people over and then uses their bodies in a twisted body switching experiment(and dumps their body in a random area after the experiment) and what do you get? Change Guy!

It's nature vs. nurture when a nerd swaps bodies with the toughest guy in school! Kang Too Jee and Woo Soo Choi have swapped...their bodies! After becoming the subjects of a mad scientist's experiment with her latest invention - the quantum teleporter - their bodies are switched, leaving only their minds and spirits intact. Woo Soo, who was once a model student, must face the life of Too Jee, a teenage menace. Never having an enemy in his life, he now has to deal with the handful of Too Jee's list, but will his kinder, gentler demeanor ward off his rivals? Or will survival determine his future? Will he become the hardened fighter that matches his new exterior? What would fight loving, battle hungry, Kang Too Jee do in Woo Soo Choi's extremely frail body!? Will they EVER get changed back to their original bodies?

This is a really good series. The art evolves throughout the series, at first it looks grimy and a bit dirty (not sure if its because of scanlation quality or simply the artist's desire to portray the world like that) but the art does get a lot better and more crisp. Fights are very interesting and the overall story is pretty good.
1st Arc: Introduction + 3 fights
2nd Arc: Deals with the high school king fight tournament
3rd Arc: The fight with the islanders