千盛根（金秀路饰）就职于首尔江南地区某著名的私立学校来说，以往外号“铁饭桶”的他在体育场上那么英姿飒爽地教学生打球，可如果遇到下雨天要上室内课的时候，他就只能叫学生自习——因为教书实在不是他的强项。在运动界内，他是号称要靠“健康的体魄过一个完美的人生”的人，可谈起“英语”，他的级别是不折不扣的“笨蛋”。近来学校之间抢夺生源的战争越来越激烈，处于“战略”上的考虑，学校作出了要解雇体育老师增聘更多英语老师的决定。交情和理事长甚深的千老师也不能幸免，为了揭穿“下岗”的危机，他向上级提出了一个奇怪的建议：受讲生以学生的家长们为对象，如果他上的这堂英语公开课能得到大家的认可，就允许他从体育老师成功“转型”为英语老师。从此，千老师就开始了斯巴达式般残酷的“受难训练”。

Chun Sung-geun, who is proud of being a first-class healthy man with his sturdy muscles, is a physical educational teacher at Yeongmoon High School , which takes pride in its top educational enthusiasm in Korea . He always smells a bribe from parents using a vertically set 4th dimensional antenna. He often discovers students' fights and makes a bet of 100,000 won on them. As a persistent teacher, he has his students play soccer on sunny days and lets them have a self-study period on rainy days. One day he faces the greatest crisis ever in his 10-year life as a physical educational teacher. Yeongmoon High School has taken super strong measures by deciding to fire a physical educational teacher and replace him with an English teacher. Chun Sung-geun tops the list of teachers likely to be fired. There is a way out of every situation! He remembers the English teacher's certificate he obtained following a woman whom he loved unrequitedly. Now Chun Sung-geun must be an English teacher E.T., not an E.T. from outer space.