On April 9, Henry and Bolbbalgan4 guested on JTBC's 'Idol Room.' Henry expressed affection for the talented duo, stating, "I used to love Bolbbalgan4. I still like them very much. I love their songs. My friends always ask me to sing 'Galaxy.' I really wanted to meet them."
Ahn Ji Young also responded with compliments, saying, "He's so musically talented and also a good singer. I wanted to meet him."
The MCs encouraged Henry and Bolbbalgan4 to ask each other questions. Henry asked, "What's your favorite code?" Woo Ji Yoon replied, "E code," and Henry said, "I also like E code."
MC Jung Hyung Don encouraged Bolbbalgan4 to ask Henry questions about his girlfriend. Woo Ji Yoon ended up asking, "Do you have a girlfriend?" Henry appeared startled and replied, "Why do you want to know that?"