A reserved and emotionless prosecutor, Hwang Si-mok, finds his perfectly ordered world shattered when he becomes entangled in a high-stakes corruption scandal within the Seoul Prosecutors' Office. Suffering from a condition that leaves him devoid of empathy, he is an unlikely hero, yet his razor-sharp intellect and unwavering logic make him a formidable force against the systemic rot surrounding him. When a brutal murder exposes a web of bribery and deceit reaching the highest echelons of power, Si-mok reluctantly partners with the warm and tenacious detective Han Yeo-jin. Together, this mismatched duo must navigate a treacherous landscape of political maneuvering and personal betrayal, where every ally could be a hidden enemy. As they peel back layers of lies in their pursuit of a dangerous truth, the series delivers a tense, cerebral, and gripping thriller that questions whether true justice is possible in a world driven by self-interest.