On April 25, Hyoyeon or DJ Hyo�guested on SBS Love FM's 'Kim Chang Yeol's Old School' and talked about her DJ debut with "Sober".�

Hyoyeon compared how the vocals to "Sober" is different from her past music. She explained, "For Girls' Generation, I have to blend in so I loosen up my voice and sing prettily, but this time, I let go of everything and sang it comfortably. I think this is my real voice. I'm slowly finding my�direction."

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As for the biggest change between promoting solo and in Girls' Generation, Hyoyeon talked about her style. She said, "Taking care of my physical appearance is not the focus (anymore) and I don't think I even look in the mirror. I think my style has really changed the most from the Girls' Generation (promotion days). In the past, I went all out in styling myself but now I think it's more natural to let myself go."

She also talked about the artists she wants to work with. Hyoyeon said, "There are so many artists like Justin Bieber, who I want to collaborate with. For domestic artists, it's Taeyeon. Her voice is fantastic. It'll be great if I can make a wonderful song and it meets Taeyeon's amazing voice."