According to the inquiry of Dalian Human Resources Market Network, "Dalian Daan Security Service Co., Ltd., a subsidiary of Dalian Security Co., Ltd., recruits a number of security inspectors to be responsible for the security inspection and security of subways and large-scale cultural and sports activities (concerts, Chinese Super League, etc.) in provinces and cities." This shows that Dalian Metro Security Inspection is Dalian Daan Security Service Co., Ltd. ..