He made his acting debut in 1998, but first drew viewers' attention in 2005 as the heroine's ex-boyfriend in romantic comedy My Lovely Sam Soon, later going on to more high-profile supporting roles in Que Sera, Sera (2007), Smile, You (2009), and More Charming by the Day (2010).

[3][4][5][6][7] Lee has since played leading roles in the television dramas The Wedding Scheme (2012), The Birth of a Family (2012), and Only Love (2014).

[8][9][10][11][12] Appearances on variety-reality shows such as the second season of Real Men in 2015 further boosted his popularity.

[13] And he was further known for his role as Baek Seok in a 2015–2016 drama series I Have a Lover.

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