People always yearn for life. When they are on the verge of death, have they ever felt unwilling to let go?
Like Qin Shi Huang and Zhu Yuanzhang, which of them didn't regret it as they lay dying? Why couldn't they live just a little longer?
Those fortunate souls on the verge of death are chosen to enter a post office, deliver letters, and fulfill the final wishes of the dead.
My name is Zhang Kai. I'm one of the lucky ones, and also one of the unlucky ones. I was chosen to deliver letters. As long as I can keep completing my tasks, I won't be erased by some sudden "accident."
