Her Breast Milk Vaccine (2020)

2030 A.D., a deadly infectious disease with a fatality rate if 99{4a0e49d581612956d15c94eb7295d1f98bc7ccc2131a8ffe9aaba4edb46c4b61} called Morumoru, is a virus that can only infect men. The only preventative measure is maternal breast milk. Sang-gyu and Jeon-seo tries to get pregnant but both couples find it hard to conceive. The change their partners to find that chances of pregnancy becomes high.