Monstrous is a South Korean streaming television series starring Koo Kyo-hwan and Shin Hyun-been. The series was made available for streaming on April 29, 2022.

Koo Kyo-hwan is a South Korean actor and film director known for his role in the films Jane (2016), Peninsula (2020), and Escape from Mogadishu (2021). He also attracted recognition for his performance in Netflix original D.P. (2021–2023).