Yang began her career in 2000 as a member of Taiwanese girl group 4 in Love, where she was given the stage name Rainie. The group's popularity in the musical industry achieved limited success. After they disbanded in 2002, Yang continued to pursue her career in the entertainment industry as a TV host, hosting shows such as the variety show Guess. After playing supporting roles in a series of Taiwanese TV dramas, including the highly popular pan-Asia hit Taiwanese series Meteor Garden, she landed the leading role as Qi Yue, in the Taiwanese drama Devil Beside You with Mike He in 2005. In the same year, she released her debut album, My Intuition, featured the hit song "Intuition" as the theme song of Devil Beside You and "Ideal Lover".