In Tiandu City, a city cut off by neon lights and viaducts, Su Yan is an ordinary person who delivers express delivery during the day and reads used bookstores at night. Until the acid rain that fell for three days and nights soaked the city and awakened the rusty sword buried in his spine. The express delivery must be delivered on time, the sword must be unsheathed to slay the demon, and all he wants to protect is a bowl of soy milk at six o'clock in the morning, the temperature of which is scalding to the mouth.
