- HD 1080
- Runtime: 92m.
- Status: Released
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- Languages: zh
- Country: Taiwan
- Director: Cheng Wei-hao
- Stars: River Huang, Tiffany Hsu, Liu Yin-Shang, Yumi Wong, Chang Pai-Chou
- keywords: ghost
- Production_studio: Once Upon a Story, Greener Grass Production, CMC Entertainment, Sky Films Entertainment, Vie Vision Pictures, Ablaze Image
- Slogan: The uninvited can only be seen when you're tagged along
- providers: Amazon Prime Video, Amazon Prime Video with Ads
- The The Tag-Along is featured in the top rankings of 2015
- #44 in Top Horror Movies of 2015
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.
