2010 – 2012: Acting career beginnings[edit]
In 2010, Lee made his official acting debut in the South Korean TV series titled Prosecutor Princess. The same year he had a supporting role in the popular drama Secret Garden where played a talented young composer with a surly attitude and a forbidden crush on the second male lead, Oska played by Yoon Sang-hyun.[9] Lee caught people's eyes with his tall, charming appearance as well as his natural acting abilities.
In 2011 September, Lee appeared in MBC's High Kick Season 3 in which he portrayed the character An Jong Seok, who is involved in a complicated love square with Baek Jin Hee, Yoon Kye Sang and Kim Ji Won.[10][11]
After his first acting experience in the horror movie Ghosts, Lee did star in the film R2B: Return to Base as a main character in his first flight movie. He played an important role with Rain appearing as part of a team of F-15K pilots. It is a remake of the original 1964 Korean Film Red Muffler/Scarf set during the Korean War.