Teh began her career as an events host in Malaysia and took part in various television and radio stations' auditions before entering the 11th season of Mediacorp's Star Search competition in 2019, where she emerged as one of the top 12 finalists.

[2] Born in Ipoh, Malaysia, Teh adopted the stage name "Juin" (郑六月) when attending university as she wanted a name that is "easy and convenient to remember" and took inspiration from her birth date.

[3][4][5] Teh auditioned for hosting roles at Kuala Lumpur Astro channel Evening Edition programme and Malaysia's radio station Ai FM, and participated in Singapore Mediacorp's So You Wanna Be A DJ competition，but did not make it through in either.

She later worked as a DJ for Malaysia's ONFM for two and a half years, and shuttled between Kuala Lumpur and Johor, where she lives.

[3] She is also part of the group "4567", which was formed by Mediacorp's artiste management arm The Celebrity Agency in 2021, along with Seow Sin Nee, Jernelle Oh and Gini Chang.