After Being Reborn Eighteen Thousand Times, I Became the Originator of Cultivation

This is a post-apocalyptic rebirth novel story line full of challenges and adventures. Guess what will happen in the apocalypse when two systematic people meet? Yan Lin, a famous novelist, witnessed the destruction of the world when the apocalypse came. Yan Lin died in the apocalypse, but was accidentally bound to the rollback system and was reborn the day before the apocalypse. - Yan Lin found himself trapped in a time loop, which would reset at 0 o'clock every day and return to the day before the end of the world. - The system issued a task to him, requiring him to learn all the knowledge and abilities in the world. - Yan Lin takes advantage of the opportunity of infinite rebirth to continue learning and accumulate various knowledge. - He began to master skills in science, medicine, martial arts, magic, and more. - The system gives him the task of making a doomsday serum, which is the key to breaking the cycle. - After experiencing 17,999 rebirths, Yan Lin finally developed the apocalyptic serum. - He gave people on earth the ability to practice in the last days and opened an era of practice for all people. Don't know the monster? I will collect and write a book Don't know how to practice? I'll create the technique Can't wake up? I'll make the serum Can't beat the monster? I'll kill! Don't ask me why I work so hard The author of the novel is somewhat chuunibyou. After all, who doesn't want to save the world?