Greg Hsu (許光漢), born Hsu Kuang-Han, is a Taiwanese actor and singer celebrated for his emotional depth, range, and screen charisma, from romantic heartbreak to intense thriller presence. He gained widespread acclaim for his dual-role performance in the hit series Someday or One Day (2019) and has since built a diverse body of work across film and television, including his striking portrayal of the enigmatic assassin Mr. Smile in the K-drama No Way Out: The Roulette (2024). Hsu’s performances have earned him multiple prestigious nominations, including Golden Bell Award nods for Best Supporting Actor (Have You Ever Fallen in Love, Miss Jiang?) and Best Leading Actor (Someday or One Day) at Taiwan’s premier television awards. His film credits span A Complete Life (2013), Hijra in Between (2018), Back to the Good Times (2018), A Sun (2019), My Love (2021), the theatrical adaptation Someday or One Day: The Movie (2022), Marry My Dead Body (2023), Behind the Blue Eyes (2023), The Invisible Guest (2023), and 18×2 Beyond Youthful Days (2024). On television he has appeared in Dive into Love (2013), Qseries: Love of Sandstorm (2016), Qseries: Have You Ever Fallen in Love, Miss Jiang? (2017), My Dear Boy (2017), Attention, Love! (2017), Art In Love (2017), Inference Notes (2017), Meet Me @1006 (2018), Nowhere Man (2019), Someday or One Day (2019), Ru: Taiwan Express (2020), Rainless Love in a Godless Land (2021), Light the Night (2021), GG Precinct (2024), and No Way Out: The Roulette (2024). His work has earned both critical praise and popular recognition across Asian and international audiences.