After her elite background was discovered the other day, netizens have uncovered proof of�CHI CHI member�Ji-U's dedication to music. Pictures from her high school days were revealed through her minihompy, documenting her practice with the haegeum, a Korean traditional instrument. She attached the captions, 'During my 12th grade entrance exam', and "This was when I already had callouses so it didn't hurt much... Calluses where are you now...." Although they were a testament to her love of music, fans were shocked nonetheless by the deep callouses on each of her fingers. A representative from her agency stated, "Jiyoo is a practice worm. Despite her young age, her passion has been maintained due to the hard effort she put in since she was a child. She does not mind having to practice hard to fulfill her dreams." The hardworking idol is currently a student of traditional Korean music at�Ewha Women's University. Source: Newsen via Joins