Stealien Cyber Drill System is a cyber hacking defense training platform that provides practical, hands-on exercises simulating real-world attack and defense scenarios. It is deployable either on a client's own server or via Stealien's hosted server, and operates as a web-based application once installed. The platform includes training content across multiple domains including web, mobile app, IoT, system, network, and malicious code (malware). Content is delivered in both unidirectional and bidirectional formats, and covers current threat topics such as ransomware and 0-day vulnerabilities discovered through Stealien's internal research institute. Hacking scenarios developed during penetration testing engagements are also incorporated into the training content. Administrators have access to a dedicated admin page for managing competitions, teams, users, and tracking user progress. Content settings such as names, descriptions, and point allocation can be customized. Additional problems and content areas can be developed and added on request. Users access the system via a web page to download and solve hacking challenges, developing both offensive and defensive capabilities. The system is designed to support internal security skill assessments. Clients include educational institutions and organizations such as KERIS, Yeungnam University, Kongju University, Korea Welfare University, and others.