In the romantic-comedy "Mr. and Mrs. Single," the movie tackles the Chinese social phenomenon of secret marriages for young couples looking for better jobs and higher income. A young man with high mortgage payments to fulfill takes the job of a personal-assistant to a female CEO under the condition that he is still single.

Coinciding with a grand local holiday celebration, wealthy businessman Zheng Bingrui invites his daughter Tingting's teacher Li Huiping and a group of classmates' parents to a party at his home, but Tingting is suddenly kidnapped. Police officer Zhang Jingxian led the team to investigate the case, the kidnappers to Ting Ting life threat, requiring Zheng Li with a huge ransom to the appointment, along the way the two found the kidnapping case behind the hidden secrets ......