The film stars Rainie Yang, Hsu Wei-ning, Francesca Kao, Lung Shao-hua and River Huang.

Meeting the mysterious Lin Mei-hua, who imprisons her own daughter inside her house covered with papers written with spells and encountering the missing and pregnant Shen Yi-chun in an abandoned hospital.

Mei-hua's youngest daughter confronts her deceased older sister and reveals her mother love for her, causing the red girl to banish the demon inside her and her soul finally passes on to the afterlife to rest in peace.

At Filmart, the film sold distribution rights to more than 19 regions, which is triple the number for the original The Tag-Along.

Three weeks after its release in Taiwan on 25 August 2017, The Tag-Along 2 became the top domestic box office hit in 2017.