Seventy Dressed as the Heroine's Best Friend

[The main text and extras are both finished], the next book is "Sixty Years Old Girl Dressed as a Best Friend"! Lin Yuyu, a plant-type superpower in the apocalyptic world, traveled through time and became an educated youth who went to the countryside. This educated youth was also the heroine's best friend. As the heroine's best friend, in the original plot, the original protagonist was blessed to follow the heroine. At least he lived through the turbulent times safely and married a kind and honest man. However, Lin Yuyu, who came from time travel, did not want to take this path. Intention: Live a positive life!