She began her career in the entertainment industry by making several appearances on television as a child, before debuting as a member of South Korean girl group NewJeans in 2022.

The following year, Marsh ventured into acting, voicing Ariel in the Korean dub of live-action adaptation of The Little Mermaid (1989).

[15] "Attention" topped South Korea's Circle Digital Chart and won Best K-pop Song at the 20th Korean Music Awards.

[20][21] In May 2024, Marsh hosted the Korea on Stage – New Generation concert, organized by the Cultural Heritage Administration.

[23] In March 2023, she became a global brand ambassador for Yves Saint Laurent Beauty and appeared in a promotional campaign for their Candy Glaze lipstick.