S1E7: Episode 7

Zhang Haixia was not trapped in a fantasy. He knew he had been poisoned because he smelled the distinct stench of cured meat when he first met Chen Xifeng—a foul odor that went entirely unnoticed by the others on the ship. Realizing his perception was altered, he knew his mind was playing tricks on him. Despite his paralyzed legs, his intellect remained fully functional, allowing him to set a series of traps in his room to capture his assailant.