Border drug police officer Du Xuanran witnessed the tragic death of his partner during an operation. In order to uncover the "ghost" within, he volunteered to infiltrate a transnational drug cartel. On the line between life and death, he met Luo Xinxi, a core member of the group whose identity is a mystery. Is he an enemy or a friend? When trust and betrayal intersect, can he hold on to the bottom line in the poisonous cave and uncover the truth of the bloody conspiracy?
