Because a colleague occupied the only remaining parking space and hit him in front of his daughter, Joe decided to "retaliate." In order to "retaliate" successfully, he tried to change, integrate himself into his colleagues, make himself handsome, make himself stronger, and learn self-defense skills so that he is no longer bullied. He found that life had started to get better. No longer complain about the troubles of life, career, and love.
In fact, all this is just because he became active. Actively change, actively face, and actively resolve. At the end of the film, when he discovered that he had "success" without "retaliation", he forgave his colleagues.
View more about Joe Somebody reviews