Corpse Fisherman from Han River

Along the Han River, three generations of the Li family have been corpse collectors. Grandpa left behind a leather handbook, with the rules written on the first page: Do not fish out corpses that are standing upright, corpses that are thundered, and people who are wearing red clothes. In the autumn when he was twenty-seven, Li Shen broke the third rule. The night the body of the woman in red came ashore, a village appeared in the river that shouldn't exist; from the next day, people started calling his name in the water. Ten years ago, his father picked up the identical corpse of a woman in red, and then disappeared, leaving only a note—— "Don't fish for Hong Yi." Following the wish of the deceased, Li Shen dived into the bottom of the river and saw a city that had been sealed for thousands of years. He finally understood that the Li family had never guarded a river, but a gate. And he is the last generation of gatekeepers. To open or not to open?