It tells the story of a secret and sweet real-life romance between Seo Hye-jin, a veteran cram school instructor, and Lee Jun-ho, a quirky student who returns after a decade to stir her heart.

[16][17][18] Park Kyung-hwa announced as the writer while Studio Dragon and JS Pictures managed the production of the series.

[4] Jung Ryeo-won and Wi Ha-joon were offered the lead roles for the series in July and October 2023, respectively.

[20] The soundtrack of the series, led by music director Lee Nam-yeon and featuring an American band The Restless Age was revealed on May 10, 2024.

[21][22] The Midnight Romance in Hagwon's soundtrack album was released on June 30, 2024; it contains all of the singles and background tracks from the series.