Eels like to live in clean and pollution-free waters. Eels grow in rivers on land, and when they mature, they migrate to spawning sites in the ocean to lay eggs. They only lay eggs once in their lives and die after laying eggs. This way of life, contrary to the upstream migration of salmon, is called downstream migration. This story comes from the trip of eels, which is as difficult to define as eels. About eels, it is more about life itself, from the clumsy and romantic journey of eels to the profound and moving mystery of life.