On February 7, Red Velvet guested on SBS Love FM's 'Kim Chang Yeol's Old School'. 

Irene first talked about her friendship with Black Pink's Jennie. She said, "We used to go to the same salon and she approached me first and we became close. We have also gone out to eat together."

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Maknae Yeri talked about her close bond with Girls' Generation's Taeyeon and revealed she often sleeps over at her house. DJ Kim Chang Yeol asked Yeri if Taeyeon cooks her good food when she goes over, and Yeri answered, "We order food because we're lazy people."

Yeri also talked about IU, and said, "I have a lot of interest in writing music and I'm thankful to IU unnie because she gave me a lot of help."