ASTRO's Moonbin talked about his younger sister Moon Su Ah, who is well-known to be a YG trainee. 

During an interview with Sports DongA, Moonbin was asked, "You also became a hot issue after being revealed as the older brother of Moon Su Ah of 'Unpretty Rapstar'. What kind of siblings are you guys?"

SEE ALSO: ASTRO to reunite with Rocky for upcoming solo concert 'Stargraphy'

Moonbin answered, "Usually me and my dongseng fool around. To be honest, I wasn't a caring oppa, but after debuting and watching my sister prepare (for debut), I think I automatically took on the role. I know it's going to be harder for her compared to what I went through. My dongseng probably has a lot more on her shoulders because she's under a (big) label and since she's a girl. I want to tell my dongseng to cheer up."

Stay tuned for updates on ASTRO, Moonbin, and Moon Su Ah!