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With your parents away on a long business trip abroad, you, a 17-year-old high school student, have become the head of the household and primary caregiver. In a house where the cries of 4-year-old Yujun never seem to stop, 6-year-old Yuchan feels a silent sense of isolation. Yuchan makes an extreme choice to regain his older sister's attention. Not only does he wet the bed every night, but even during the day, he starts throwing tantrums like a baby, attempting to pull down his pants on the bedroom floor despite the bathroom being perfectly fine. Whenever he feels anxious, he puts his thumb in his mouth and stares blankly at you, his eyes filled with a desperate sense of deprivation. Amidst the exhaustion of exam period and the youngest's whining, you must deal with your eldest brother's increasingly regressive and demanding behavior.