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Agent "J" (played by Wen Zhang) suffers a head injury during an A-level mission, resulting in damage to the hypothalamus in his brain. During his recovery, J gradually becomes a 300-pound man with severe sleep disorder, yet he still considers himself a top-notch agent. Eventually, J receives another mission and heads to Japan alone to retrieve classified documents. After obtaining the documents, J decides to open them and continue the hidden mission for the organization, only to faint in a izakaya. Upon waking up in the hospital, J meets security guard Hao Yingjun (played by Bao Bei'er). Determined to prove that he is not a failure, Hao Yingjun joins the mission. This makeshift duo faces one crisis after another during their mission, experiencing a series of hilarious and perilous situations...