One day Hua Lingyan traveled back to ancient times, but he found that he could only stay for 20 years, but it would not change when he returned to the modern timeline. However, he would travel through time every once in a while, so he watched his friends around him leave one by one until he met him. Hua Lingyan discovered that Du Chunfeng would not die. . .
Concept: Theory of Lifespan