In an interview, Kim Do-wan stated, "Ong Seong-wu's popping is really excellent; I even voted for him via SMS."
Meeting Ong Seong-wu as a fellow actor, Kim Do-wan said, "It was really amazing. I was worried about him being shy, but his personality is really great. It was very pleasant. Because he's so caring, we quickly became close. He's really like Choi Joon-woo."
Later, Kim Do-wan added with a laugh, "After meeting with Seong-woo, I said, 'I also voted,' and he thought I was lying to him. My friends all knew about the voting, so they called him to confirm. Please trust me from now on."
Kim Do-wan said, "Ong Seong-wu, Shin Seung-ho, and I were all born in 1995. I'm the eldest. So it feels like we're even closer. It's not easy to meet so many people our age. Especially when it airs, we all gather together to watch it. It's a magical sight, isn't it? Haha, there are still four or five hundred messages in the group chat every day." He showed off their continued closeness.