He gained national prominence in the 2016 period thriller film The Age of Shadows and became recognized by international audiences for his portrayal of Jang Deok-su in the hit series Squid Game.

[1] Prior to acting, he sold televisions in the Russian market for LG Corporation.

[1] Heo began his acting career in 2011, when he entered SBS's talent show Miraculous Audition (기적의 오디션).

[2] He gained national prominence as Ha Il-soo in the 2016 period thriller film The Age of Shadows.

[3] In the 2021 Netflix original series Squid Game, Heo starred as the gangster Jang Deok-su.