18 Again is a South Korean television series based on the 2009 film 17 Again by Jason Filardi, likely inspired by the 1988 comedy movie of the (series') same name featuring George Burns. Starring Kim Ha-neul, Yoon Sang-hyun, and Lee Do-hyun. It aired on JTBC from September 21 to November 10, 2020, every Monday and Tuesday at 21:35 (KST). The series is available on iQIYI and Viu with multi-language subtitles.

17 Again is a 2009 American teen fantasy comedy film directed by Burr Steers. It stars Matthew Perry, Zac Efron, Leslie Mann, Thomas Lennon, and Michelle Trachtenberg, with Melora Hardin and Sterling Knight in supporting roles. The film follows a 37-year-old man named Mike (Perry) who becomes his 17-year-old self (Efron) after a chance accident.