Nam Joo-hyuk is a South Korean model and actor. He began his career as a model, and appeared in several music videos before making his screen debut in 2014 with The Idle Mermaid. He rose to prominence with his role in the television series Who Are You: School 2015 (2015), and has since become known for his leading roles in Weightlifting Fairy Kim Bok-joo (2016), The Bride of Habaek (2017), The Light in Your Eyes (2019), The School Nurse Files (2020), Start Up (2020) and Twenty-Five Twenty-One (2022).

The Idle Mermaid is a 2014 South Korean romantic comedy television series starring Jo Bo-ah, On Joo-wan, Song Jae-rim, and Park Ji-soo. A modern retelling of the 1837 fairy tale "The Little Mermaid" by Hans Christian Andersen, it aired on tvN from August 7 to October 9, 2014 on Thursdays at 23:00. Originally slated to run for 14 episodes, the total number of episodes was reduced to 10. The series inspired an unofficial Indonesian adaptation called Mermaid in Love.