(CNN) They might have legions of adoring fans, but seven famous K-Pop stars have fallen foul of South Korea's Ministry of Education.

The popular entertainers, who are all male, have officially had their college diplomas revoked because they were busy rehearsing and performing when they should have been in class.

Education bosses discovered that the individuals in question, folk singer-songwriter Chu Ga-yeol, three members of the boy band Highlight -- Lee Gi-kwang, Yong Jun-hyung, Yoon Doo-joon -- as well as their former bandmate Jang Hyun-seung, and Seo Eun-kwang and Yook Sung-jae from boy group BTOB, had not attended enough classes to fulfill the requirements for graduation.

Their identities were reported by the Korea Times and confirmed to CNN by a South Korean official. CNN has requested comment from their representatives.

An inspection by the Ministry of Education revealed that the celebrities were signed up to the broadcasting and entertainment department of Dongshin University, situated approximately 190 miles from the South Korean capital, Seoul. According to a ministry press release, this meant the entertainers "could not have normally attended the classes," due to their TV and entertainment schedules.

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