It turns out that Seong Han-bin's younger brother is a national sports climbing team member.

2025 International Sport Climbing Federation Seoul World Championships Media Day KBS Live

ZerobaseOne's Seong Han-bin appeared at the media day for the 2025 International Federation of Sport Climbing (IFSC) Seoul World Championships!
I found out that he attended to support his younger sister, Seonghan Areum, who was appointed as the competition's promotional ambassador.
It was the first time I found out that my younger brother was a national representative.
My older brother is an idol and my younger brother is a national representative😱 My parents must be proudㅎㅎ