This is an extremely special family. Its long-term members consist of only two people - Old Duan, the retired lighting engineer of a drama troupe, and his 25-year-old daughter-in-law DuoDuo, a young actress in the same drama troupe. DuoDuo married into the Duan family at the age of 22. The year after they married, her husband Shaogang began his long journey abroad to study, becoming a constant "passer-by" in this home who always comes and goes in a hurry. The marriage between DuoDuo and Shaogang is more like a "romance", while Old Duan is more like a roommate and buddy under the same roof.