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Jeong Hye-yeon (June 21, 2021). "김요한→김영대, '학교 2021' 주연 캐스팅.. 올 하반기 방송[공식]" [Yohan Kim → Youngdae Kim, cast as the lead in 'School 2021'.. Broadcast in the second half of this year [Official]]. Herald POP (به کرهای). Naver. Retrieved June 21, 2021.