Zhao Yiyang and Fan Moyuan, a couple who were passionately in love in the 1960s, were forced to separate due to the influence of the Cultural Revolution. Although everyone started their own families due to the pressure of reality, they have always maintained a unique way of contacting each other: calligraphy letters. They insisted on using the unique "ink elephant" style of letter writing in small regular letters to talk about their experiences in life. They miss each other without affecting each other's family and hope for their own happiness; they encourage each other but regret that they cannot look forward to each other's life. This special method of communication has continued into the current era when printers are filled with A4 paper.
As time goes by, Zhao Yiyang has already become a famous calligrapher. He and his daughter Zhao Rui jointly run their own "Mo Yuan Zhai" in a certain city. The daughter deeply understands her father's secret and has been silently supporting her father's platonic love from behind.
At the same time, shortly after the death of her husband, Fan Moyuan's son Xiao Yi discovered several letters between herself and Zhao Yiyang. Xiao Yi was puzzled by his mother's behavior and even made rude remarks, which seriously hurt his mother's self-esteem. Soon Fan Moyuan died of illness due to worries.
On the days when Fan Moyuan fell ill, Zhao Yiyang never received any letters, and he was depressed all day long. For this reason, his daughter saw it and was anxious in her heart. In order to relieve his father's worries, Zhao Rui decided to go north to find the aunt his father had longed for.
When Zhao Rui found Fan Moyuan’s address after all the hard work, she found that the old man had been dead for many days. At the same time, Xiao Yi also discovered all the letters while sorting out his mother's belongings, and was moved by the extraordinary love between his mother and Zhao Yiyang.
After a long talk, in order to prevent the remaining old man Zhao Yiyang from leaving any regrets, the two young people planned to continue a beautiful plan...
On this day, Zhao Yiyang suddenly received a letter from Fan Moyuan again. He was so excited that he suddenly came to life...
What was even more unexpected was that the old man Zhao Yiyang had actually seen through it long ago. The hard work of the two young people led to the love between their daughter and Xiao Yi.