A divorce lawyer and a marriage counselor have been married for three years and filed for divorce at the same time. During the cooling-off period of thirty days, whoever withdraws first will leave the house. The two "relationship experts" began to use their lifelong learning to set up a trap for each other: she would be the perfect wife, and he would be the model husband. Both sides are waiting for the other to break down and admit defeat first. Thirty days are up. No one retracted. The divorce is effective. Then they discovered that the past thirty days were the best thirty days in their three-year marriage.