Based on Wee Ki Chuls best-selling novel & directed by Yoon In Ho, When I Turned Nine follows the warm adventures of a young boy growing up in 1970s Korea. Yeo Min (Kim Suk) spares no efforts to help the people around him, going so far as to beat up the bully to defend his friends. Yeo Min is also a good son, working as a vendor to save up money & buy his mother a gift. Owing to all his great deeds, the clever boy enjoys huge popularity everywhere. However, Yeo Mins life is in for a drastic change after a mysterious girl (Lee Se Young) from Seoul transfers to his school.