Delicious Milk is in the Bathhouse.

'''Introduction to the Work: Hyunsoo, who comes down to his hometown every vacation to help at his parents' bathhouse. One evening, as he endures amidst rumors of redevelopment and dwindling customers, a man appears, handsome to an unfamiliar degree. After that, he visited the bathhouse every single day, staring intently at Hyunsoo to an oddly excessive degree, and without fail, bought and drank a white milk each time. "Let's make it a hundred thousand per day." Then one day, the man proposes a single condition. Exclusive use of the bathhouse from 10 PM to 2 AM. Desperate for money, Hyunsoo accepts the offer, and the quiet late-night bathhouse is left with just the two of them.......