Engineer Goes Back to the Past to Make up for His Regrets

A retired engineer often had bad feelings due to various regrets in his life. After encountering an interstellar spacecraft built by the Chinese nation in the future that mistakenly entered this time and space, he got the opportunity to copy the memory to his 26-year-old self in the past life through the cooperation with the digital life that controlled the spacecraft. After the memory fusion, he found that his experience before the age of 26 in this plane had been greatly changed by the intervening spacecraft. How could he change the many regrets of himself, his family, his unit, and even the country with the memories of his past life...