[7] Byeon transitioned to acting in 2016 with minor roles in several dramas such as Dear My Friends (2016), Moon Lovers: Scarlet Heart Ryeo (2016), Weightlifting Fairy Kim Bok-joo (2016), Record of Youth (2020), and Strong Girl Nam-soon (2023).

He gained widespread popularity[8] for his portrayal as Ryu Sun-jae in the time slip, romantic comedy, television series Lovely Runner (2024).

[9] Byeon other works of this period include having sung the original soundtrack (OST) for the drama Lovely Runner which charted on the Billboard Global 200.

[12] Following his departure from university and subsequent work as a model, Byeon fulfilled his mandatory military service as an administrative officer in the Public Relations Department of the 37th Division from November 2011 to August 2013.

[17] His modeling career included work for numerous fashion magazines and advertising campaigns, with notable appearances in publications like Arena, Cosmopolitan, W, and Elle.

Byeon began his acting career with minor roles in several television dramas, including tvN's Dear My Friends, as Son Jong-shik,[15] SBS' Moon Lovers: Scarlet Heart Ryeo as Ha-jin's former boyfriend, and MBC's Weightlifting Fairy Kim Bok-joo as a fencer.

[18] In 2017, Byeon was cast as the main lead of tvN's Drama Stage History of Walking Upright as Jong-min,[19] the male friend of the female protagonist.

[26] In the same year, Byeon received his first leading role in the Netflix film 20th Century Girl as Pong Woon-ho a high-teen male protagonist with a clear and refreshing image.

[32] On July 19, 2023, he was cast in his first leading role as Ryu Sun-jae with tvN's time slip romance television series Lovely Runner, opposite Kim Hye-Yoon.

[48] On December 2, Kakao Entertainment announced Byeon would star in MBC television series The 21st Century Grand Prince's Wife,[49] portraying the lead role of Lee Ahn.

[61] Two months later, he was selected as model for iloom,[62] Ediya Coffee,[63] Contact lens brand, Olens,[64] and Kyochon Chicken.

[73] Cultural critic Kim Heon-sik said Byeon has "unique appeal characterized by a blend of masculinity, androgynous charm, and an image of trustworthiness".