Both Pinghai and Su Chun graduated from famous universities in Shanghai. Getting married in this city is Pinghai's biggest dream, and the place they choose to settle down is just a rented Shikumen house of 10 square meter. It is enough to save the first issue and become a house slave. Pinghai's sister seaweed and her boyfriend Beckham rented a three-bedroom apartment, and only waited for the down payment to talk about marriage.

A poor couple and a "white-handed" couple are also happy. It seems that all the changes started with Pinghai raising the down payment everywhere. Four people are pushed into an uncontrollable orbit by life, and everything seems to be reversed by the appearance of the fifth person. This man is Song Siming, secretary-general of the municipal party committee. He met seaweed at a dinner party, and her sleepwalking expression brought him back to college.

I lost my job and indirectly worked as a part-time foreign teacher through Song's introduction, which unexpectedly opened up my career. And he was saved from jail because of the appearance of Song. Knowing that he could never recover his simple relationship with Beckham, seaweed became Song's "professional mistress" ... Finally, when the family moved into their new house and life gradually improved, seaweed waited alone with Song's son. She didn't know that Song was a "big traitor like loyalty and righteousness" in officialdom.