I Am Kind Enough to Give Qin Shihuang the Elixir of Immortality at the Beginning.

[Wandering Myths, everything you like about China and foreign countries, ancient and modern, is available here. Chen An, an ordinary migrant worker who was diagnosed with late-stage brain cancer, accidentally awakened a [Black Book of Destiny] that could travel through time and space. As long as you complete the heaven-defying tasks in the book, you can obtain the "destiny authority" of a great man in history. However, when he turned to the first page, his whole body went numb. [Mission: Send the real elixir of longevity to Qin Shihuang. [Reward: The First Emperor's "Ancestral Dragon's Qi"! "System, are you serious? If you give him the elixir of longevity, this world will not be able to win until the end of the universe?" [Temporary ability: Jing Ke's Thorn (1 time). [Jing Ke's Thorn: Instantly gain the power of assassin Jing Ke's "Pictures and Daggers", and have a perfect opportunity to assassinate or escape. … In Xianyang Palace, Ying Zheng looked at the world and asked Chen An in front of him: "Sir, you have done a good job in offering medicine. What reward do you want?" Chen An looked at this eternal emperor and said with a smile: "There is no need to offer a reward, because I will go to Xiang Yu later." Ying Zheng: "???"