Victims of sexual grooming do not realize the damage until there is sexual exploitation by criminals and until a considerable amount of time has passed after the experience. Therefore, the damage rate is reported or estimated to be lower than the actual statistics. Recently, sexual exploitation against teenagers with high online usage rates, such as the "n-bang", is rapidly spreading, which is a social problem. In particular, non-face-to-face crimes are expected to increase due to the spread of Corona 19. Therefore, it is most important to prevent crimes by identifying the intentions of criminals for sexual exploitation online. As a result of research, online sexual grooming are characterized primarily by strangers. In addition, in the criminal process, the personal information of the victims is collected by actively utilizing the online characteristic of “anonymity” and the identity of the victim is deceived. Then, it starts by selecting a victim who is physically and emotionally isolated or vulnerable, and forming an intimate relationship. Words that are often used for this purpose are found to be ‘story about a sexual or non-sexual topic’, ‘praise’, and ‘us’. However, in recent years, there is a phenomenon that the series of steps is skipped or accelerated. Research into these processes and characteristics will identify the MO of criminals, which will allow them to predict and estimate criminals in advance. This will be of great help for the police to investigate entrapment and prepare alternatives for criminal policy.