A Life Task is something everyone in the Spiritless World has. Everyone strives to fulfill their own Life Task.
Once you've completed your Life Task, you're free to decide how to live the rest of your life. That's what the Will of the World says, and no one may defy it.
Then one day, Yan Zhi learned what her Life Task was, and her ordinary life came to an end...
Yan Zhi: For crying out loud! You give me the highest-difficulty Life Task right off the bat? Could you make it any more ridiculous?! (╯‵□′)╯︵┻━┻
Will of the Spiritless World: Sorry, but it actually gets worse...