[2][3] Since his acting debut with Signal in 2016, Seo has appeared in dramas such as Solomon's Perjury (2016–2017), School 2017 (2017), My First Love (2018), and Revenge of Others (2022).

Seo debuted as an actor in 2016, which he took a minor role in the drama Signal as the main culprit in the Inju female student case.

[10][11] In 2017, Seo starred in the teen drama School 2017,[12] and featured in the black comedy series Prison Playbook.

[16] In May, Seo was cast in the fantasy romance drama Tale of Fairy alongside Moon Chae-won and Yoon Hyun-min.

[18] The same year, Seo was cast in the youth historical drama Flower Crew: Joseon Marriage Agency.