Doctor of Medicine Lin Aoxue invented a new drug X-ONE, which was regarded as the primary target of the dark world and stepped into a dangerous situation. X-ONE is a raw material that can be used to make harmful and profitable products, so this new drug has become a treasure that the dark forces are eyeing and want to snatch. In order to assist the forces of justice in fighting the dark world and help the society eradicate this cancer, Su Rui accepted the task of hiding his identity and secretly protecting Lin Aoxue and X-ONE liquid. Because he was injured in the war, Su Rui's physical fitness will be affected by PTSD, and his strong special forces ability will suddenly be lost in a specific environment. Faced with sinister and unpredictable opponents, the danger of the mission exceeded Su Rui's expectations, but for the fate of mankind, Su Rui faced the difficulties and exerted his strongest advantages under difficult conditions. Lin Aoxue did not trust Su Rui at first, and various misunderstandings occurred between the two, but when the dark forces attacked, Su Rui risked his life again and again to save Lin Aoxue, which made Lin Aoxue begin to re-examine this cynical soldier bodyguard.