Zhai Siming (born 5 November 1996) is a Singapore-based Chinese actor, model, and TikTok personality.^[1]

Born in Hebei, China, and the only child of a single-parent family, Zhai moved to Singapore with his mother, at the age of seven. Zhai's mother has since relocated to Maryland, U.S. for her beauty business, when he was 19.^[2] She had initially planned for Zhai to join her after he completed his studies in Singapore, but his participation in the Star Search 2019 competition changed the plans.^[3]

Growing up attending local schools, Zhai has been a basketball enthusiast since he was young.^{[citation needed]} At the age of 17, while studying in Secondary 5 at Orchid Park Secondary School,^[1] he successfully auditioned for a role in the 2014 basketball film Meeting the Giant, which was directed by Tay Ping Hui and produced by Zhu Houren.^[3][4]

At 1.87m tall, Zhai is formerly a part-time model and an engineering student at Temasek Polytechnic.^[1] He began modelling after he was scouted for Hey! Gorgeous in 2015. Zhai has also acted in many small part roles on television and worked numerous part-time jobs, including selling ice cream door-to-door, waiting for jobs at banquets, and working in retail, prior to joining Star Search in 2019, where he was one of the top 12 contestants at the finals.^[1] In an interview, Zhai named Taiwanese actor Eddie Peng as one of his "biggest inspirations" as he admired Peng's determination and passion in his numerous action movies.^[3]

In 2021, Zhai, Herman Keh, and Tyler Ten were teamed up as the group "HST" by Mediacorp's artiste management arm, The Celebrity Agency. The trio were previously signed to the same modelling agency and had known each other before joining the Star Search competition.^[5][6]

Zhai is also a TikTok personality who has accumulated more than 115K followers and 1.3 million "likes" to date.^[7]