The year 2020 marked the 40th anniversary of the Gwangju Uprising, during which hundreds of unarmed civilians in Gwangju, at the time the provincial capital of South Jeolla Province, were killed in a deadly military crackdown.
Ryu Jin portrays the Geum family's first son Geum Sang-baek. Park Tam-hee portrays his wife (the Geum family's first daughter-in-law) In Young Hye. (This couple has twins: Kim In Yi as Geum Sang Bake (eldest of fraternal twins) and Ok Jin Wook who portrays Geum Min Seo).
Im Hyung Joon portrays the Geum family's second son Geum Sang-goo (a broadcasting PD). Yoon Hae Young portrays his wife (the Geum family's second daugher-in-law) Oh Min-hee.
Lee Tae Gu portrays the Geum family's third son Geum Sang Min; he is obsessed with painting
Just speculating here, but I think Han Geu Roo's (Wang Ji Hye) love interest may be one of the following: Lee Je Moon (37 year-old Yoo Jang Young) the design team leader at Arang Publishing Company where Han Geu Roo is editor-in-chief. Choi Ji Wan (40 year-old Park Jae Jung) representative of a children's publishing company, where Han Geu-roo is editor-in-chief
K-Drama 
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https://www.soompi.com/article/1462224wpp/lee-dong-wook-in-talks-for-new-ocn-drama-from-director-of-the-uncanny-counter
https://twitter.com/dramapotatoe/status/1377093954034749441?s=20
https://www.netflix.com/title/81437733?s=a&trkid=13747225&t=cp
https://twitter.com/kdramacasting/status/1375338186881134595
https://www.soompi.com/article/1460899wpp/chun-woo-hee-and-kim-moo-yeol-in-talks-for-new-thriller-drama-along-with-seo-kang-joon
https://koreajoongangdaily.joins.com/2020/07/15/entertainment/movies/Now-playing-Gwangju-Video-The-Missing-The-Singer/20200715190400391.html
https://www.koreanfilm.or.kr/eng/films/index/filmsView.jsp?movieCd=20209954
https://www.viki.com/movies/37732c-double-patty
https://www.viki.com/movies/37731c-mission-possible
http://www.koreatimes.co.kr/www/art/2020/07/398_292212.html
Prison term sought for ex-President Chun over defamation related to The Gwangju Uprising 1980.
http://www.koreatimes.co.kr/www/nation/2020/10/113_297059.html
https://www.soompi.com/article/1459589wpp/rain-confirmed-to-star-in-new-fantasy-medical-drama
Lee Go Eun portrays Han Da Bal's daughter Min Sol.
Park Tam-hee portrays his wife (the Geum family's first daughter-in-law) In Young Hye.
(This couple has twins: Kim In Yi as Geum Sang Bake (eldest of fraternal twins) and Ok Jin Wook who portrays Geum Min Seo).
Im Hyung Joon portrays the Geum family's second son Geum Sang-goo (a broadcasting PD).
Yoon Hae Young portrays his wife (the Geum family's second daugher-in-law) Oh Min-hee.
Lee Tae Gu portrays the Geum family's third son Geum Sang Min; he is obsessed with painting
Lee Je Moon (37 year-old Yoo Jang Young) the design team leader at Arang Publishing Company where Han Geu Roo is editor-in-chief.
Choi Ji Wan (40 year-old Park Jae Jung) representative of a children's publishing company, where Han Geu-roo is editor-in-chief
https://en.wikipedia.org/wiki/Be_My_Dream_Family
https://youtu.be/MmYoqhter5Y