Model-turned-actress Lee Sung Kyung appeared on 'Radio Star' on March 23, where she was asked which co-star from 'Cheese in the Trap' she would nominate to appear on singing competitive program, 'Mask King.'

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Without hesitation, she chose Kim Go Eun, explaining, "When we went out for a company dinner, Kim Go Eun perfectly sang 'Let It Go.'  When Kim Go Eun goes to the karaoke, she has her own unique repertoire.  She sings Celine Dion songs.  That is why I want to nominate Kim Go Eun for 'Mask King.'  I would like for Kim Go Eun to display her talents."

She added, "I really like Kim Go Eun's monolids.  She looks like a puppy when she smiles."