The series was directed by Kim Moon-gyo, who previously worked on Trolley (2023), and written by Lee Hyun, who previously worked on Diary of a Prosecutor (2019).

Connection was produced by Studio S, Soul Pictures, and Good Wave, Inc., and a special teaser was released on December 29, 2023, ahead of its 2024 broadcast.

This series marked the first time Ji Sung and Jeon Mi-do worked together on a project.

Connection was Ji Sung's comeback on SBS since Doctor John in 2019.

The drama was Jeon Mi-do's first leading role in a drama on a terrestrial channel since she debuted as an actress in 2006.

At the 2024 SBS Drama Awards, Connection won the Daesang-adjacent Drama of the Year award, and cast members received several honors, including Best New Actress for Kim Min-ju and Best Actress in the Miniseries Genre/Action category for Jeon Mi-do.

Kwon Yul and Kim Kyung-nam both won Best Supporting Actor in the Miniseries Genre/Action category at the 2024 SBS Drama Awards, while Yoon Sa-bong and Jung Yoo-min won Best Supporting Actress in the same category.