Apt

“Don't turn off the light… someone in your apt.”

Oh Se-jin (Ko So-young) wants to know why people in her neighborhood keep dying, and she will not leave the question alone. Ahn Byeong-ki sends her to the apartment complex around her, where Detective Yang Na-sun (Kang Seong-jin) is working the same deaths, and the answers do not come easily. Se-jin keeps asking, and every answer she gets only draws her in further.