Wang-gu a single father of twin baby girls, is juggling a demanding job and raising his daughters who are keeping him up at night. With his daughters refusing to take bottled baby milk, he decides to ask for advice on a website called Baby Sitter, where people recommend he feed them breast milk.
This turns out to be a problem since he can’t feed them breast milk as he is a single father. However, a particular advisor recommends a place where he could buy breast milk after buying the milk.
Wang-gu is surprised by the seller of the breast milk, a woman named Woo-hee, who lives in a fancy mansion. Woo-hee wakes up something in Wang-gu that has been asleep for a long time, the only problem is that Woo-hee is in a relationship with an abusive egomaniac