Lee Byung-hun and Shin Min-a were cast together again 17 years after starring in the film A Bittersweet Life.

Lee Byung-hun and Han Ji-min reunited for this drama 6 years after appearing together in the film The Age of Shadows.

Park Ji-hwan and Yoon Byung-hee worked together again after the film The Roundup, marking their second collaboration.

Go Doo-shim and Kim Hye-ja reunited 6 years after co-starring in the tvN drama Dear My Friends.

Han Ji-min, Kim Hye-ja and Lee Jung-eun worked together again 3 years after the JTBC drama Just Between Lovers (also translated as 'Off to One Side').

Director Kim Gyu-tae and writer Noh Hee-kyung collaborated for the sixth time, having previously worked together on dramas such as The World That They Live In, Padam Padam, That Winter, The Wind Blows, It's Okay, That's Love, and Live.

Director Kim Gyu-tae and actor Lee Byung-hun reunited 13 years after working together on the KBS drama Iris.

The roles of Jung In-kwon and Bang Ho-sik were originally considered for actors Sung Dong-il and Yoo Hae-jin, respectively, but they ultimately did not join the cast.

Shin Min-a and Kim Woo-bin were reported to be considering roles in the series as early as April 2021, with the full cast confirmed in October 2021; the show marked Kim Woo-bin's return to television after a 6-year hiatus since Uncontrollably Fond in 2016.

Filming began on Jeju Island in October 2021 after the full cast was finalized, and about 70% of the shooting took place on the island.

On February 9, 2022, lead actor Lee Byung-hun tested positive for COVID-19, halting production since February 7; he announced his recovery on February 21, 2022.

Singer Lim Young-woong's song 'Our Blues' was first released as a pre-release track from his debut full album and was used as background music in the emotional reconciliation scene between Ok-dong and Dong-seok in the final episode.

The series was exclusively licensed to Netflix and released simultaneously in over 80 countries worldwide, including North America, Europe, and East Asian countries such as Japan.

Our Blues became one of the highest-rated dramas in Korean cable television history.