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Sulli shared on her me2day on the 3rd, "My little brother. My baby came out to cheer on his noonas for their 'Music Core' stage. He gave them kisses and showed his aegyo and then left. Thanks San Yi. I saw how you excitedly danced when noona was performing."

Sulli's brother was seen being held in Victoria's arms and bringing his noonas of f(x) to smiles with his cute expressions.

Fans commented, "So cute", "Sulli seems to care a lot about her little brother", and more.