As night fell over the city, a bizarre murder case sent shockwaves through the entire metropolis. Suspect Mo Geng was in the same sealed room as the victim. What's more, the scene contained enough blood to kill another person, as well as a murder weapon! One dead, one missing, and Mo Geng had no way to clear his name... Microexpression expert Yu Qing, relying on his sharp instincts and exceptional intelligence, resolved to lift the veil on the case. As the investigation deepened, he gradually discovered that it was connected to a major anti-drug operation three years earlier, one that had caused heavy police casualties. Everyone involved had secrets and motives of their own, and the truth seemed to grow more elusive by the day. Yet Yu Qing refused to give up. He bravely entered this dangerous maze and faced off against the forces of darkness in a heart-pounding battle. As the contest of wits and courage unfolded, the truth gradually came to light, only to lead to an even more shocking conclusion. Who was the real killer? What was the conspiracy behind it all? And who was carrying a grievance that would never let go?