"Beautiful undercover" is a common means for police to solve crimes. It means that in criminal investigation, the police use male undercover with handsome appearance, sunny personality and strong social skills to go deep into criminal gangs and obtain criminal evidence, so as to achieve the purpose of cracking down on crime. The police will recruit male undercover with certain conditions and abilities, including age, appearance, identity, personality, eloquence and other requirements, and will conduct professional training and training to improve the success rate and safety factor of their undercover work. During the undercover period, undercover personnel need to conceal their identities, go deep into criminal gangs, obtain important information and evidence, and give support and assistance to the police at critical moments, and finally help the police solve the case.