Hee-kyung and Seung-ah are cosmetics shop employees. One day, a customer demands a refund, saying she developed more eye wrinkles after using an anti-wrinkle cream she bought from the store. Will the two sales clerks be able to keep their cool with the customer’s groundless claims?

高胜锡（李俊基 饰）是个沉默寡言的男孩子，喜欢看书思考的他实际上是一个打架高手，能一个打七个。 上班族张家弼（李文植 饰）因为女儿被男同学欺负，平时就胆小如鼠的他下决心要为女儿报仇，所以他找到了高胜锡，希望胜锡能教会他如何与人打架。家弼苦苦恳求后，胜锡才答应了当家弼的师父。接下来，胜锡安排了一系列艰苦训练，各种各样的训练层出不穷。 40天的训练过去了，家弼整个人都焕然一新。决战的日子就要来临了，家弼到底能不能战胜强大的对手为女儿报仇呢？