Rainbow's Jaekyung is not the only idol in her family. Her little brother Kim Jae Hyun has officially debuted as part of the band N.Flying. 

Jaekyung tweeted on October 2, "My younger brother has debuted in Japan! He's the one with the blue shirt! Please give them attention."

N.Flying is a four-member band with members Kwon Kwang Jin, Cha Hoon, Kim Jae Hyun, and Lee Seung Hyub. They just released their debut single "Basket" on the 1st and will be performing at a series of concerts.

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In related news, Rainbow had their first Japanese fan meeting last month.