After finishing her art major, Yoon pursued an acting career, with supporting roles in the television series Playful Kiss and Moon Embracing the Sun.

Yoon first caught the public's eye in 2006 in Alex Chu and Ji Sun's music videos for "Very Heartbreaking Words" and "I Love You", and received the moniker of "Snail Girl."

Supporting roles in films and TV series followed, notably as Ha-ni's quirky best friend Min-ah in romantic comedy Playful Kiss,[1] and as slave-turned-swordswoman Seol in the hit period drama Moon Embracing the Sun.

[2][3] In 2012, she landed her first leading role in Channel A rom-com series Miss Panda and Mr. Hedgehog, playing a cake shop owner opposite Super Junior's Lee Donghae.

[6] After a romantic tweet that actor Kim Mu-yeol meant to be a private message to Yoon was accidentally posted on his Twitter page, their agencies confirmed in February 2012 that the two were dating.