Jang, Jin-ri (March 14, 2024). '시그널' 시즌2 나온다...김은희 작가 "'범죄도시' 제작사와 준비 중" ['Signal' Season 2 coming out... Writer Kim Eun-hee, "We are preparing with the production company of 'Crime City'"] (in Korean). SPOTV News. Retrieved March 14, 2024 – via Naver.
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star.ohmynews.com
Lee, Mina (August 20, 2015). "이제훈, tvN 드라마 '시그널' 출연". Oh My Star News (in Korean). Retrieved August 27, 2019.