When Gong-chan (Lee Dong-wook) meets the lively and beautiful Yu-rin (Lee Da-hae), he finds out that she has connections to his missing cousin, who his grandfather has been searching for a long time. He asks Yu-rin to lie about being his long missing cousin until he can find his real cousin. She says yes, but soon their feelings for each other get in the way of their plans. Gong-chan's friend Jung-woo (Lee Joon Ki) falls for Yu-rin while Gong-chan's ex girlfriend, Seo-hyun (Park Si Yeon), who is a pro tennis player, tries to win him back. Will the two ever tell each other how they feel? Will Gong-chan ever find his real sister? My Girl was a Top Ten hit in Korea in 2006, aided by the appearance of hot new actor, Lee Joon Ki.