2000年，一位特立独行的老师，以一句「我要当老师！」开启了他的教师生涯。 幼稚又无厘头的教学方式，影响了无数学子。从此，他成了传说中的王牌棒球教师──徐磊！ 但是成为“王牌棒球教师”之路似乎没有那么容易，曾经美若天仙的爱人突然摇身一变成小胖，原本帅气十足的磊哥也变成了流落街头的“游民”从此一蹶不振。在教导主任的哄骗与劝说之下，他重新回到武德高中担当师职，重整破败的棒球队。面对爱人远去毫无音讯、生活三餐不继，还有学生们接连闹事，徐磊大喊：我是不会放弃的！坚持，就是我们教导学生最重要的一课。

Wu De High School was once famous for its baseball team. However, as the trump card coach Xu Lei left 20 years ago, the glory and honor of this school were gone. The baseball team and its students lost their hope and good tradition, now going down day by day. The headmaster of the school wants to find the old coach who now lives in a slum to save the baseball team and the school. To trick Xu Lei back, the master even told a story of his lover. Finally, Xu Lei decided to accept the invitation and join the team again. However, things seem not so simple like that.