Trapped for 21 days. 700 million won on the line. 29 strangers behind closed doors. One man who changes everything. Yoon Ji-won accepted a substitute driver position he never sought. What he didn't anticipate was being confined in a sealed facility alongside 29 dangerously magnetic men for three weeks. What he couldn't have foreseen was a charismatic younger man—Number Three—who becomes impossible to ignore. A cryptic recruitment process leads Ji-won into an exclusive, high-pressure operation with compensation he cannot refuse. The stakes are simple: comply. endure. survive. Then Number Three arrives, and Ji-won's carefully constructed reality fractures. Searing glances. Deliberate proximity. An attraction that ignites beyond control. Is this predetermined? Or orchestrated deception? A psychological thriller for those drawn to charged hierarchies, claustrophobic suspense, and dangerous chemistry bound in contemporary BL intrigue.