S-1 CORPORATION is a Korea-based company mainly engaged in the provision of security solutions. Along with subsidiaries, the Company operates its business through three segments. Security System Service Segment is involved in the provision of installation service of security systems, integrated security services and safety products. Building Management Service Segment is involved in the provision of real estate services, including the management of property and its revenue, real estate brokerage and consulting services. Call Center Service and Telemarketing Segment accepts and processes complaints and requests from customers.