Kim Hye-soo and Kim Ho-jin, a couple working for the same airline, are a typical millennial DINK (Dual Income No Kids) couple. As they approach their third year of marriage, Kim Ho-jin, eager to start a family, clashes with Kim Hye-soo, who feels it's too early to become parents. After much back-and-forth, they agree to have a child, but despite their efforts, conception proves difficult. Kim Hye-soo resorts to various folk remedies, modern medical treatments, and dietary plans, even going so far as to experience a false pregnancy.