On September 8 episode of 'Fantastic Duo 2', Wheesung and G-Friend's Yuju performed together.

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During the interview segment, Yuju introduced herself and explained how she became a fan of Wheesung. She said, "When I was younger, I was a student who didn't watch a lot of TV or computer. But one day, I turned the TV on by chance and saw Wheensung sunbaenim performing 'Insomnia'. At the time, it had a huge impact on me because I didn't know you could make a song based on the idea of insomnia and the song was stuck in my head all day. Since then, I've been a fan."

After the interview, the two moved on to sing Wheesung's "With Me" and "I Even Thought of Marriage" that excited everyone in the studio. The audience gravitated towards the whole performance and was completely engaged in the amazing collaboration. 

Check out the clips!