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Goo Byoungjin is a supporting character in Do It One More Time.

Though timid and with poor social skills, both Daegwang and Sunyoung know that he becomes the wealthy CEO of KOSDAQ in his later years.Yoo Sunyoung tries To date him as in he has an happy future ahead but fails badly due his studious nature and social skill.He seems to have feelings For Min Huk.