Seah was a finalist on
Star Search in 2010. He starred in the web series ''
Let's Play Love in 2011. He appeared in the 2013 television dramas 96°C Café and Mata Mata
. In 2015, he starred in the historical thriller film 1965 and the television drama The Journey: Our Homeland. He starred in the television drama Tanglin'', which aired from 2015 to 2018. In 2019, he starred in the television dramas
My One in a Million and
Hello From the Other Side. Seah appeared in the 2021 television dramas
Mind Jumper,
Key Witness ,
Loving You, and
Justice Boo. He replaced
Shane Pow on the television drama
The Heartland Hero, which aired from 2021 to 2022. In 2022, he starred in the television dramas
Soul Detective and
The Unbreakable Bond . ==Personal life==