Zhang Klai (played by Im Si-wan), whose highest level of education is only the high school appraisal examination, has no foreign language ability, no specialties, and no skills, has nothing but Go in his lonely life. Due to family changes when he was young, he failed to apply for a graduate degree at the Korean Chess Academy, and he has been giving up on himself and doing nothing. At the age of 26, while still doing odd jobs, he used his connections to land in a comprehensive trading company and became an intern in the sales team 3. On his first day on the job, Zhang Keli couldn't even use a copy machine, and he had to ask for help from fellow intern Ahn Young-yi (played by Kang So-ra) for such trivial matters as answering the phone. When he first entered the workplace, he was surrounded by colleagues with first-class foreign language proficiency and excellent work ability. He was immediately surrounded by a huge sense of frustration and felt that he was out of place and ashamed. At the same time, after Zhang Keli's special identity as a paratrooper was exposed, he was immediately questioned and excluded by the interns in the same period. Section Chief Wu (played by Li Shengmin), his immediate boss of Business Group 3, also has a grudge about Zhang Keli’s identity. This made Zhang Klai realize that he has nothing, and he can only survive here if he works harder than everyone else... This film is adapted from the online comic of the same name written by Yin Taihao, which is called the "working class textbook."
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