ASTRO’s Moonbin And Billlie’s Moon Sua Prove They Have The Sweetest Sibling Relationship

They took full advantage of overlapping promotions!

ASTRO‘s Moonbin and Billlie‘s Moon Sua are one of the iconic sibling duos in K-Pop. Both siblings worked tirelessly to achieve their dreams of becoming an idol and have encouraged each other along the way.

In the past, they have shown their teasing bickering, making fans laugh at how they tease each other.

Like when Moon Sua teased her brother in the comment section of a post about their pet cat Roa.

Netizen: “Sooah-nim, you take such pretty photos of Roa. So prettyㅜㅜㅜ”

Moon Sooah: “I’m definitely better than my brotherㅎㅎ”

But even though the two eagerly tease each other, they also are incredibly supportive.

Since Moonbin debuted before Moon Sua, he definitely has fully embraced his older brother role, giving her honest feedback about her dancing, promising to give her advice and support in an interview, and even buying her debut album.

And when he bought The Billage of Perception: Chapter One, Moonbin even amusingly realized that he might win a fan call with his sister.

  • “Ah about the raffle.”
  • “It’s a secret.”
  • “She doesn’t have a handphone so.”
  • “My phone number will be leaked?”
  • “Well if that happens I can just change it.”
  • “What should I ask her if I do get to go…”

And now, with both siblings promoting around the same time, they have further showcased their support for one another.

Billlie made their comeback with their second mini album, The Collective Soul and Unconscious: Chapter One, on February 23rd.

Moonbin also made his unit comeback with Sanha with their second mini album REFUGE on March 15th.


We love supportive siblings😭 Love that they incorporated one another’s comeback into their performance/end fairy! Nobody can do it like Moon Siblings✨ @astro_official @Billlie Official #moonbin #moonsua #astro #billlie #kpop #who #gingamingayo

♬ original sound – multi

Fans noticed that in Billlie’s “GingaMingaYo” stage on March 24th, Moon Sua incorporated Moonbin’s choreography for “WHO” into her performance.

(Top) Moonbin performing “Who” and (bottom) Moon Sua performing “GingaMingaYo” | @astroswaterfall/TikTok 

And Moonbin returned the favor by incorporating the iconic move from “GingaMingaYo” into his ending fairy for his “WHO” stage on March 25th.

(Top) Moon Sua performing “GingaMingaYo” and (bottom) Moonbin performing “Who” | @astroswaterfall/TikTok

But not only did they promote each other through their own performances, but they also filmed two TikToks together.

Moon Sua endearingly gave Moonbin a hug at the end of her TikTok.


소중한 문남매💜 #아스트로 #문빈 선배님과 함께🌝 #Billlie #빌리 #GingaMingaYo #GGMGY_challenge @astro_official

♬ GingaMingaYo (the strange world) – Billlie

Moonbin (left) and Moon Sua (right) | @billlie.official/TikTok 
| @billlie.official/TikTok  

And Moonbin teasingly wouldn’t comply with Moon Sua’s heart at the end of his.


GingaMinga하지 않은 문남매의 매력에 벗어나지 못할 걸💫 #문수아 X #문빈 #WHO_Challenge 🔮 #아스트로 #ASTRO #문빈_산하 #MOONBIN_SANHA #MOONBIN #SANHA #REFUGE #MOONBIN_SANHA_WHO #Billlie #빌리 @billlie.official


Moon Sua (left) and Moonbin (right) | @astro_official/TikTok 
| @astro_official/TikTok 
| @astro_official/TikTok 

Hopefully, we will see more adorable sibling interactions from these two talented idols in the future!

You can watch Billlie’s “GingaMingaYo” stage here.

You can watch Moonbin and Sanha’s “WHO” stage here.


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