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On a rainy night in Seoul, Seo-yeon rescues a mysterious black cat named Mandu. But at 3:33 a.m., a stranger appears in her kitchen—and he seems to know more about her cat than he should. Kang Tae-ha hides a centuries-old curse, and as their lives become tangled, Seo-yeon discovers that the scariest monsters may have the loneliest hearts.