On the April 23 broadcast of KBS 2TV's 'The Seasons - Sung Si-kyung's Ear Friend,' Sung Si-kyung reacted to Seventeen Seungkwan's way of addressing him. On that day's show, singer Gummy and Seventeen Seungkwan appeared as guests.

Seungkwan expressed his feelings about his first appearance, using the phrase "senior stars like Kiraseong." In response, Sung Si-kyung said, "Don't say Kiraseong. No Kiraseong when juniors appear," showing his discomfort. Sung Si-kyung then mentioned that Seungkwan called Gummy "noona" (older sister), saying, "So you call her noona." When Gummy said, "You seem very uncomfortable," Sung Si-kyung added, "I'm Kiraseong. Here, she's noona. I didn't expect to become Kiraseong."

That day, Sung Si-kyung also mentioned Seventeen's recent status. He said, "Isn't Seventeen doing the best right now? All 13 members renewed their contracts and went on a world tour." Seungkwan explained, "We performed 31 shows in 14 cities. I heard about 900,000 people joined us in total." Sung Si-kyung emphasized, "Then you're Kiraseong. I'm just Seong. Si-kyung Seong."