Yubin and Sunmi had a Wonder Girls reunion backstage at JOO's musical and JOO's younger brother BTOB's Ilhoon also visited to show his support!

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JOO tweeted, "Thanks Sunmi jjyaeung, Yubin unni, and Ilhoonie who came to watch my musical~~~^^ I love you <3<3<3<3," along with the snapshot of the family reunion of her JYP family and brother. She also posted, "sis&bro <3 The pretty dongseng who came to see noona's performance... My solid dongseng #BTOB#Ilhoon."

JOO is currently starring in the musical remake of 'Full House', which will run until June 8 at the Hongik Art Center. Wonderfuls were also happy to see Yubin, who has been enjoying her hiatus since her days on the OCN drama 'The Virus'.