克里斯·加纳（威尔·史密斯）是一个聪明的推销员，他勤奋肯乾努力，却总没办法让家里过上好日子。妻子琳达终究因为不能忍受养家糊口的压力，离开了克里斯，只留下他和5岁的儿子克里斯托夫相依为命。事业失败穷途潦倒，还成为了单亲爸爸，克里斯的银行帐户里甚至只剩下了21块钱，因为没钱付房租，他和儿子不得不被撵出了公寓。
克里斯好不容易得到了在一家声名显赫的股票投资公司实习的机会，然而实习期间没有薪水，90%的人都没有最终成功。但克里斯明白，这是他最后的机会，是通往幸福生活的唯一路途。没有收入、无处容身，克里斯唯一拥有的，就是懂事的儿子无条件的的信任和爱。
他们夜晚无家可归，就睡在收容所、地铁站、公共浴室，一切可以暂且栖身的空地；白天没钱吃饭，就排队领救济，吃着勉强裹腹的食物。生活的穷困让人沮丧无比，但为了儿子的未来，为了自己的信仰，克里斯咬紧牙关，始终坚信：只要今天够努力，幸福明天就会来临！皇天不负苦心人，克里斯最终成为一名成功的投资专家。
Chris Ghana(Will Smith) is a clever salesman, his hard work hard work, but overall no way to make a better life at home. His wife, Linda, after all, because we can not endure the pressure of breadwinners and left Chris, leaving only him and 5-year-old son, Christopher had each other. The dead-end down and the cause of failure, but also became a single father, Chris's bank account or even only a 21 money, because the money to pay the rent, he and his son had been thrust out of the apartment.
Chris finally got the stock at a prominent investment company the chance to practice, however, there is no salary during the internship, 90% of the people have no ultimate success. But Chris understand that this is his last chance, is the only road leading to a happy life. No income, nowhere to go, Chris sole owner, is the sensible son of unconditional trust and love.
They are homeless at night, sleep in shelters, subway stations, public bathrooms, and all you can for the time being housed in open spaces; day meal money on the line and get relief, eating barely wrapped belly food. Extremely frustrating to live in poverty, but to his son's future, in order to their own beliefs, Chris teeth, and always believe: Just today, work hard enough, happiness will come tomorrow! Heaven rewards those who are righteously, Chris eventually become a successful investment professionals.
