Yoo In-na

At the age of 16, Yoo In-na joined an entertainment agency as an apprentice singer in 1998, and had nearly become part of a girl group. After 11 years and five different agencies, she could not be prominent. Yoo said she had difficulty memorizing the dance choreography required of K-pop singers, and after practicing for eight hours a day, six days a week, she had resigned from becoming an idol.

In 2006, Yoo joined YG Entertainment as an aspiring actress. She said, "If singing wasn't meant to be, I decided to give acting a go because it seemed fun. I never gave up. A lot of my friends did, though, even though they were prettier and more capable than me." She first came to note in 2009 with the sitcom High Kick Through the Roof on MBC. Several supporting roles followed, notably in the 2010 drama Secret Garden, which she received a Best New Actress award at the Baeksang Arts Awards, and as the second female lead in Hong sisters' romantic comedy The Greatest Love.

She was an MC for TV Entertainment Tonight from March 3, 2011, to June 4, 2012, for which she won Best Variety Entertainer at the SBS Entertainment Awards. She was also the DJ for KBS Cool FM's Let's Crank Up the Volume, which is the highest-rated radio program in its timeslot across both AM and FM bandwidths.

Yoo's vocals were featured in Humming Urban Stereo's 2011 digital single "You, That Day" (넌 그날). She also sang for the soundtrack of her 2011 film My Black Mini Dress alongside her castmates Yoon Eun-hye, Park Han-byul, and Cha Ye-ryun.

In 2012, Yoo starred in her first leading role in the tvN time-slip romance series Queen and I.