On the April 6 broadcast of SBS's travel variety program 'No Math School Trip', the cast members played games related to music on the bus while heading to their next destinations. 

Lee Yong Jin suggested that they each take turns naming a musician or artist, and the answerer must immediately respond by singing a song by that named musician. The person remaining as the last player would face punishment. For example, the PD called out "Davichi", and Zico sang the duo's song "8282". 

Jannabi's Choi Jung Hoon also avoided punishment by singing "Sea of Love" at the mention of the male duo Fly To The Sky. Next, at the mention of singer Lee Soo Young, Crush could not react quickly enough. Disappointed, he asked, "Give me one more." 

At that, Lee Yong Jin playfully said, "Red Velvet," causing Crush to freeze up. The other cast members burst into laughter, as Yang Se Chan teased, "Why are you so tense? Just hum the song." 

Crush sheepishly replied, "I stopped breathing for a minute," while the show's captions also jokingly read, "He must know someone from that group." 

Meanwhile, Crush and Red Velvet's Joy have been dating publicly since 2021.