该电影由朴善才执导，车艺莲、赵汉善、崔弼立、金静华、朴孝敏、郑钟宇、金正泰、金汉钟、金在一、강필선、文瑞妍等主演，于2021年上映。在110分钟的叙事中，《追随者2021》（又名：关注者、Midnight Thriller - Follower）The story of Yeon-Hee who appears to be having a happily married life but is actually experiencing domestic violence. Little by little, Yeon-Hee begins to fall into danger after her SNS account was hacked.