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, 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. At the 56th Golden Bell Awards in 2021, he took both best actor in a TV series for "Born Into Loving Hands”and best supporting actor in a miniseris for HBO Asia’s "Workers”. In 2023, he also took best supporting actor in ACA&GOTT Awards organized by Busan International Film Festival, and best actor in 58th Golden Bell Awards for"Taiwan Crime Stories”. ()