At their father's wake, two sets of brother-in-law and sister-in-law couples meet for the first time. On the table lies a will. The condition for inheriting the estate is: "From the moment this will is found until the funeral, the couples must swap spouses and fulfill their duty to conceive three times." The wake and funeral are filled with uncertainty. Faced with the obligation to repay debts, couples make a difficult decision to protect their happy families and cherished married life... What will become of them?