Hsueh Shih-ling (Chinese: 薛仕凌; Pe̍h-ōe-jī: Sih Sū-lêng; born June 10, 1983), also known as 40 or MC40, is a Taiwanese actor, singer, rapper, songwriter, and television presenter.

Hsueh was known as MC40 from award-winning hip-hop band Da Mouth, with DJ Chung Hua, Harry Chang, and Aisa,[1] before embarking on a career in acting.

He writes most of Da Mouth's song lyrics and is considered one of the best and fastest rappers in Taiwan with his multi-language rapping ability.

Hsueh was born on June 10, 1983, in Sanmin District, Kaohsiung and was raised in Vancouver, British Columbia, Canada.

He attended Fu Jen Catholic University Department of English, in New Taipei City, Taiwan.

[7] Due to health considerations and future planning, all four members of Da Mouth chose not to renew their contracts after the release of the 5th studio album, "What The…".

Subsequently, he concurrently and consecutively developed his singing, acting, and hosting career until the disbandment of Da Mouth.

His performance in “Eye of the Storm” earned him a nomination for Best Supporting Actor at the 2023 Taipei Film Awards.