A little leaf goes on a big journey of change, experiencing loss, grief, nostalgia, resistance and acceptance along the way.

Pigsy is a street-smart loser who often messes things up. One day, he is chosen to enter the new world to become a symbol of success. He can finally make grandma proud. Soon after, though, everything turns out to be a mistake. Pigsy doesn't want to be treated as a joke anymore. He makes a secret deal with Bull Demon King. He stays in Sanzang’s group, and gives the information to Bull Demon King who wants to achieve eternal life. In exchange for information, Bull Demon King promises to show him a secret passage to the new world. Adapted from the classic novel "Journey to the West" as science fiction.