Delivery boy Fu Haoran is naturally funny and loves to cause trouble, but on the way to deliver an order, he accidentally exchanges souls with the powerful imperial marshal Gu Yanchen. One is a worker at the bottom who works hard for food and clothing every day, and the other is a strong man at the top who holds heavy troops and is coerced by the desire for power. Their completely different lives are misaligned. Fu Haoran used his identity as a young marshal to disrupt the court structure with his funny thinking, but accidentally activated the contract system hidden in his body. He could sign contracts with strong men and strange beasts, and use their power to grow rapidly. However, Gu Yanchen occupied Fu Haoran's body and wanted to regain his identity and power. He secretly planned it and became the biggest obstacle to Fu Haoran's growth. From a low-level deliveryman to a contracted war god, Fu Haoran relied on his funny attributes to resolve the crisis, relied on the contract system to counterattack step by step, and lost his youth in the bloody battle. While fighting for the soul with Gu Yanchen, he met partners and concluded a contract. In the end, he broke the shackles of fate, climbed to the top of the strong, and lived the life he most wanted.
