[4] In December 2018, Lee started his acting career as a supporting character in the hit tvN television series Memories of the Alhambra as a hacker-programmer, starring Hyun Bin, whose agency VAST Entertainment recruited him immediately.

[10] In September of the same year, he made a successful big screen debut in the war film The Battle of Jangsari.

In February 2020, Lee was cast in a supporting role in the JTBC television series When The Weather Is Fine alongside Yang Hye-ji.

[13] Before the year ended, he appeared in a cameo role as his former drama character from Extraordinary You in tvN's True Beauty alongside Kim Hye-yoon.

[16] In June 2022, Lee returned to the small screen with the tvN period fantasy drama Alchemy of Souls alongside Jung So-min.

[19] In December of the same year, he reprised his role as Jang Uk in Alchemy of Souls: Light and Shadow, alongside Go Youn-jung.

[24] He is one of the most popular endorsers, working with high-end brands such as Prada and Lancôme, as well as promoted Dior, Nike, Berluti, Armani, Zegna, EX NIHILO, and Fendi.