Sa-rin and Moo-young studied at the same college. Years later, they run into each other and fall in love. But once they get married, they realize that the reality of marriage is different from what they expect. Sa-rin is a career woman who is very good at her job, but not when it comes to her in-laws. Sa-rin is asked to prepare a birthday meal for her mother-in-law and constantly struggles with what to get as birthday presents for her in-laws. On the other hand, Goo-young's older brother, Goo-il, and his wife, Hye-rin, have no problem saying what's on their minds to the in-laws. Can ordinary daughter-in-law Min Sa-rin persevere in the complicated world of in-laws?