The Tag-Along: Devil Fish

Wei is nowhere to be found one day before his grandma returns from her own strange missing incident. Wei's girlfriend desperately searches for his whereabouts and discovers that a little girl in red followed them before their disappearance. Based on true events and long-circulating urban legend in Taiwan.

When social worker Shu-fen discovers that her pregnant teenage daughter Ya-ting has disappeared, her search for Ya-ting ends her with many horrifying mysteries… Meeting the mysterious Mei-hua who imprisons her own daughter inside her house covered with papers written with spells and encountering the missing and pregnant Yi-chun in an abandoned hospital, the trio returns to the Red Forest to rescue Ya-ting and Shu-fen finally realizes that the deepest fear arises from love…

When a spirit medium is called to exorcise a demon from a possessed man, he is unknowingly captured in the act by two students looking to document the process. When the students accidentally release the devil fish demon into the world, it is up to them and the spirit medium to send it back to the hellish world from where it came.