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kbsworld.kbs.co.kr
"Manhole". KBS World. Archived from the original on 2020-01-09. Retrieved 2017-08-02.
Kim, Jin-seok (2 September 2017). '맨홀', 1.4% 기록… 역대 드라마 최저시청률 1위. JTBC News (in Korean). Archived from the original on 2024-05-27. Retrieved 2017-09-02.