Written by Twins: a Letter Delivery Journey Across Yin and Yang

In the end of the Dharma era when yin and yang are out of balance and cause and effect collapse, there is a group of people called "Messengers" - they travel through the gap between life and death, delivering letters that fail to arrive and repairing the broken cause and effect. Xiaoshuai, an ordinary delivery boy, was accidentally involved in a dispute in the underworld and became the most "unprofessional" messenger in history. He doesn't know magic, he doesn't know how to control ghosts, he only has a dilapidated takeaway truck and an obsession to "deliver the letter". And Bai Wuchang, the most mysterious judge in the underworld, hides thousands of years of loneliness and secrets under his smiling mask. He was originally the executor of reincarnation, but during a mission, his heart was moved by a "dead letter". When he and Xiaoshuai met on the bank of Wangchuan River, two pens and two lives were intertwined into a letter delivery journey across Yin and Yang. What they want to deliver is not just a letter - it is a regretful farewell, an unspoken love, a forgotten promise, and a truth that has been tampered with for thousands of years. As the seven "dead letters" were opened one by one, they discovered that the real enemy was not ghosts or the King of Hell, but the "rules" themselves that had been distorted by power. The rise of the new King of Hell actually stems from a letter that has never been sent - a confession that transcends reincarnation and is written to Bai Wuchang. When a messenger dies for his faith, when a judge rebels against his fate for his love, They will use the pen as their sword and their faith as their guide, Rewrite reincarnation and restart cause and effect. This is an Eastern fantasy epic about obsession and redemption, rules and warmth. This is a message delivery journey that spans Yin and Yang, life and death. And in the end, what they handed over was the last letter to the world.