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Hyung Jung-min (July 19, 2021). "유지연, '해피니스' 출연 확정…조우진 아내 역" [Yoo Ji-yeon confirmed to appear in 'Happiness'... Jo Woo-jin's wife]. sportsworldi (به کرهای). Naver. Retrieved July 19, 2021.
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Kang Young-cho (July 28, 2021). "[단독]한준우, tvN '해피니스' 캐스팅…한효주·박형식 만난다" [[Exclusive] Jun-woo Han, cast for tvN's 'Happiness'... Meet Han Hyo-joo and Park Hyung-sik]. Sports Seoul (به کرهای). Naver. Retrieved July 28, 2021.
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Ha Ji-won (September 8, 2021). "배해선, '해피니스' 캐스팅…한효주·박형식과 호흡 [공식입장]" [Bae Hae-sun, cast for 'Happiness'... Breathing with Han Hyo-joo and Park Hyung-sik [official position]]. Xports News (به کرهای). Retrieved September 8, 2021 – via Naver.
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viu.com
"Happiness". Viu Hong Kong. Retrieved 14 November 2021."Happiness". Viu Philippines. Retrieved 14 November 2021."Happiness". Viu Singapore. Retrieved 14 November 2021. "Happiness". Viu Indonesia. Retrieved 14 November 2021."Happiness". Viu Malaysia. Retrieved 14 November 2021."Happiness". Viu Thailand. Retrieved 14 November 2021."Happiness". Viu Myanmar. Retrieved 14 November 2021."Happiness". IQIYI. Retrieved 16 October 2021.