Lee Jong-suk walked on the Seoul Collection catwalks in 2005 at the young age of 15, making him the youngest and most talked-about male model to debut at Seoul Collection program for Seoul Fashion Week. As soon as he debuted as a model, he was loved by many designers as a muse. He was boasting quite the extensive modeling career having walked fashion runways for some of the biggest shows. Since then he has walked in a number of fashion shows hosted by many of the top brands in Korea
Before debuting as an actor, he prepared to debut as an idol group member. He stated that he prepared as an idol group member for three months and had signed with the agency because it said it would help him act, but it didn’t keep its promise so he quit.
Lee Jong-suk, who majored in Professional Motion Pictures Art at South Korean Konkuk University, took part in a selection for actors at SBS TV station when he was currently in middle school. He participated in acting activities as one of the SBS 7th open recruiting actors.