Lee went on to star in the television series 18 Again (2020), Sweet Home (2020–present), Youth of May (2021), The Glory (2022–2023), and The Good Bad Mother (2023), as well as the film Exhuma (2024).

[3] Lee Do-hyun made his acting debut in the 2017 black comedy Prison Playbook, in which he portrayed the young version of Jung Kyung-ho's character.

[6] The same year, Lee also appeared in Clean with Passion for Now, playing the female lead's younger brother and a promising Taekwondo athlete.

[17] He also starred in KBS2's Youth of May, a drama set in 1980 during the Gwangju uprising, earned him a "Next Generation Melo-king" title for his spectacular performance in a melodrama genre.

[23] In December, Lee returned to the small screen with the Netflix drama written by writer Kim Eun-sook titled The Glory, with Song Hye-kyo.

[24] In 2023, Lee chose Death's Game as his last project before joining the military because of the bond he made with director Ha Byung-hoon, which he worked with in 18 Again.