Lee mempelajari seni teater di [[Seoul Yesul Daehak|Institut Kesenian Seoul]] dan belajar [[balet]] selama enam bulan.<ref name=nate />
DiaIa melakukan debut aktingnya di film ''[[A Good Lawyer's Wife]]'' pada tahun 2003 dan sejak itu ia membintangi beberapa peran di layar lebar seperti ''[[The Aggressives]]'' (2005),<ref>{{cite web|title=K-FILM REVIEWS: 태풍태양 (The Aggressives)|url=http://twitchfilm.com/reviews/2005/10/k-film-reviews-the-aggressives.php|publisher=Twitchfilm|date=22 October 2005}}</ref> ''Riverbank Legends'' (2006), ''Humming'' (2008), ''[[Beautiful (film 2008)|Beautiful]]'' (2008),<ref>{{cite web|last=Lee|first=Hyo-won|title='Beautiful' Shows Ugly Side of Beauty|url=http://www.koreatimes.co.kr/www/news/art/2008/11/141_18920.html|publisher=Korea Times|date=14 February 2008}}</ref> dan ''Barbie'' (2011).<ref>{{cite web|last=Kim|first=Heidi|title=Lee Chun-hee, Kim Sae-ron cast in new film|url=http://10.asiae.co.kr/Articles/new_view.htm?sec=ent3&a_id=2011060316473446464|publisher=10Asia|date=3 June 2011}}</ref> DiaIa juga muncul di layar kecil, terutama di ''[[Seoul's Sad Song|Conspiracy in the Court]]'' (KBS, 2007),<ref>{{cite web|title=TV REVIEWS: 한성별곡-正 (Conspiracy in the Court)|url=http://twitchfilm.com/news/2008/08/sageuk-world-special-pt1-conspiracy-in-the-court.php|publisher=Twitchfilm|date=29 August 2008}}</ref> ''[[Smile, You]]'' (SBS, 2010),<ref>{{cite web|title=Lee Chun Hee’s Music Recommendations|url=http://daheefanel.wordpress.com/2009/12/10/lee-chun-hees-music-recommendations/|publisher=10Asia/Dahee's Plastic Castle|date=10 December 2009}}</ref> ''Gloria'' (MBC, 2010),<ref>{{cite web|last=Hong|first=Lucia|title=Bae Doo-na was "worried over bad singing"|url=http://10.asiae.co.kr/Articles/new_view.htm?sec=ent2&a_id=2010072819023115910|publisher=10Asia|date=28 July}}</ref> dan ''[[Take Care of Us, Captain]]'' (SBS, 2012).<ref>{{cite web|last=Hong|first=Lucia|title=Lee Chun-hee to replace Lee Joon in TV series|url=http://10.asiae.co.kr/Articles/new_view.htm?a_id=2011102515321425959|publisher=10Asia|date=25 October 2011}}</ref>
