There are many indigenous ethnic groups, such as the Udege, Nanai, Oroch, Nivkh, and Taz, that have lived along the tributaries of the Ussuri and Amur rivers since ancient times. And each has its own particular interpretation of the world around them. Some still believe they live in a mysterious world filled with various spiritual entities, and that these creatures can either help people or commit evil. Boko, the swamp man, is a creature looks like a crooked stump, has a talent for manipulating people and tricking them to go further and deeper into swamps.
