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Jung Hyun-Su. Jung Hoseok's talented younger sister. When Hoseok leaves for Seoul for an audition for BigHit entertrainmet, Hyun-Su vows to follow in his brother's footsteps. When she turns 14, she goes to Seoul. Alone. Without parents. Just so she could see her brother. From day to day, shee lives with his brother...and his band members. How will her life go on after she moves in with seven guys older than her?

"-Oppa...where are you going?"