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Berry Good's agency Asia Bridge Entertainment stated on the 23rd, "Seoyool will make her debut starting with Berry Good's 2nd album, which will be released next month... Like her older sister AOA's Yuna, Seoyool is really charming... She will give new energy to Berry Good."

According to the agency, Seoyool was born in 1997, and dreamed of becoming a singer since she was 13 years old. She can sing, dance, and play instruments. 

Berry Good made their debut last May as a 5-member group (Taeha, Subin, Yira, Nayeon, and Gowoon). The group has been revamped since then with the two original members Taeha and Gowoon and three new members including Seoyool who are preparing for their upcoming album.