Byun Sung-hyun is known for Kingmaker (2022), Good News (2025) and The Merciless (2017).

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"The Gentlemen" and "Slow Horses" return this fall, while the "Reacher" spin-off series "Neagley" makes its debut. See our guide of the biggest Fall TV and streaming releases.

2026 Fall TV and Streaming Watch Guide

&quot;The Gentlemen&quot; and &quot;Slow Horses&quot; return this fall, while the &quot;Reacher&quot; spin-off series &quot;Neagley&quot; makes its debut. See our guide of the biggest Fall TV and streaming releases.

Get a closer look at these actors from their many TV and streaming series roles.

Streaming Stars, Then and Now

Byun Sung-hyun at an event for Kill Boksoon (2023)

Jeon Do-yeon, Kim Si-Ah, and Byun Sung-hyun at an event for Kill Boksoon (2023)

Sul Kyung-gu and Hong Kyung in Good News (2025)

Sul Kyung-gu and Yim Si-wan in The Merciless (2017)

Jeon Do-yeon and Esom in Kill Boksoon (2023)

Byun Sung-hyun

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