I'm Working as a Sleep Tester in a Haunted House.

Summary

In a tense encounter, Chen Xue, with her enhanced ability to see ghosts, senses the presence of Zhang Ling, who is invisible and aggressive. Chen He, under Zhang Ling's influence, attacks his friends with a baseball bat, causing chaos. Despite attempts to use a Divine Blade and a Ghost Heart for defense, the protagonist struggles against Zhang Ling’s power, which has seemingly increased due to mysterious symbols on her forehead. Chen Xue is possessed but is freed when a female ghost within her reacts, revealing Zhang Ling's true form. The protagonist learns he must activate his Ghost Heart with blood, leading to a surge of power and a determination to confront Zhang Ling.

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