Lee Sung Kyung made a promise for high viewer ratings of her upcoming drama 'Doctors' on the June 16 airing of SBS loveFM's 'Song Eun Yi, Kim Sook's Unnie's Radio.'

When asked about this, the gorgeous model-turned-actress said, "If the viewer ratings for 'Doctors' passes 20% I will visit the place where they post the most comments onto 'Viewer Ratings Promise SNS' and give out free hugs."

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The DJs then promised, "We will go with Lee Sung Kyung to that place and put the people who want free hugs into line so there'll be no chaos." �Good thinking ahead.

Also, Lee Sung Kyung's song, "My Lips Like Warm Coffee," with Eddy Kim broadcasted after which the DJs told her, "You sound so clear and pure. �It's like you were trained to be a singer," making her shy. �Lee Sung Kyung revealed, "These days, I'm so into rap. �While coming to the radio studio, I kept humming raps with the staff members." �The DJs addressed the listeners with, "When she appears next time, you will definitely get to hear Lee Sung Kyung's rap."