This study aimed to examine the effectiveness of dialogue police in Korea by conducting comparative research between dialogue police in Korea and its counterpart in the UK, Police Liaison Officer(PLO). In particular, this study mainly focused on the role, mission, effectiveness, and drawbacks of the PLO. Furthermore, based on a detailed review of the UK’s police liaison officer, this study presented policy implications for the Korean dialogue police. The police liaison officer has received positive reviews at home and abroad for promoting peaceful assembly and demonstration and reducing disorder through more conspicuous police activities, such as wearing a vest with high visibility. The positive evaluation on the PLO corresponds to a ‘practical hypothesis test’ that possibly and indirectly indicates the effectiveness and soundness of the Korean dialogue police. Despite the positive evaluation on the PLO, there are some limitations, including lack of detailed manuals or guidelines for dialogue police practices, potential risk of collecting intelligence beyond their designated duties, quality and welfare issues of police liaison officers on the field. Comprehensively reviewing strengths and weaknesses of the PLO in the UK, this study suggested that Korean dialogue police 1) set up a specialized education and training program to fulfill their roles, 2) set the criteria related to the scope of information collecting activities, 3) clarify the criteria for selection and placement of dialogue police officers, and 4) expand the scope of social issues where they are allowed to intervene.