He Peijin, a housewife, after quietly contributing to the family for nearly two decades, her husband suddenly filed for divorce on the grounds of cultural gap. In order to save the family, Peijin decided to apply for university as an advanced candidate, but was unanimously opposed by her husband and son. At this time, Peijin was misdiagnosed as having cancer again, and there is not much to come. Peijin decided to live completely for herself in the last time and realize her dream of going to college. After enrolling, Peijin and her son became classmates. Facing a group of classmates with generation gaps, Peijin was marginalized, but she gradually won the love of the "little" classmates with her life wisdom and personality charm.

1942, Nanjing. Following a series of assassination attempts on officials of the Japanese-controlled puppet government, the Japanese spy chief gathers a group of suspects in a mansion for questioning, and eventually, torturing. A tense game of "cat and mouse" ensues as the Chinese code-breaker attempts to send out a crucial message while protecting his/her own identity.

Zhang Hai Feng quits his job as a police officer after the death of his daughter, Duo Duo. However one day a serial murder case reveals new-found evidence about the the accident that led to Duo Duo's death. In order to find out the truth, Zhang Hai Feng starts to pursue the serial murderer and in the process, dies together with him. When he wakes up, he find himself back in the past; one day before his death occurs. He decides to make use of the wormhole to save Duo Duo from her death. Eventually, he starts to unravel deeply hidden secrets of the people around him, and the web of conspiracy that was planted 20 years ago.

Spy couple live in their midlife crisis and are controlled by higher authorities based oversea. National security agency is chasing them and higher authorities is pushing them, where can the struggling couple go?

Bai Ge, He Xu, and Li Li came to an emotional group with their own problems to ask for help. He Xu recently stumbled upon her "perfect partner" shopping with other women; Li Li wanted to protect her harassed daughter, but instead became deeply estranged from her; Bai Ge was trapped in a dreamy love. Is this intersection among the three people's lives a coincidence, or is it a well-planned encounter?