Zhao Qingqing is a very ordinary girl. She has been what her parents call a good child since she was a child. She has always been ordinary until she graduated from college and found a job. As a result, she still has not been in love until she is 25 years old. She is known as "maternally single". She also wants to change in her heart, but she is used to this state and lives a repetitive life every day. Until one day she returned to 12 years old and started her youth again. Zhao Qingqing vowed to live an ordinary life wonderfully again.