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Elementary school student Junyoung goes to the playground in the apartment complex with his younger sister Won. There they meet his classmates who lives in the same complex. They are not friendly toward Junyoung, and his excited sister is no help to embarrassed him. “Junyoung, do you live in this complex?” Without putting much thought, Junyoung quickly responds, “Yes.” His classmates dare him to go to the basement to prove that he lives in the complex. To avoid the bullying, Junyoung grabs his sister’s hand and heads to the basement. There, he witnesses something unbelievable. What is scarier than the basement scenery is the reality outside the basement.

During a home visit, Jeong-mi discovers a young boy and his little sister living in a house with a large manhole in it. The children ask Jeong-mi to go down the manhole.