In December 2008, she signed a recording contract with Warner Music Taiwan. In early 2009, Tsai and Ken Erman, the founder of the fashion brand Truth and Pride, co-founded a fashion brand, Seventy Two Changes, which was named after her 2003 studio album, "Magic" (also known as "See My 72 Changes" literally in Chinese), to include apparel and accessories; It was closed down in 2011 due to the difference of business ideas between shareholders in mainland China and United States. In March 2009, Tsai released her tenth studio album, "Butterfly". Commercially, the album sold more than 1 million copies in Asia, with more than 190,000 copies sold in Taiwan alone, and became the best-selling album of the year in Taiwan. However, media and critics reacted negatively, who commented that the album was a "confusing patchwork". The title track, "Butterfly", reached number ten on the Hit FM Top 100 Singles of the Year. The song, "Real Man", also reached number twenty-five on the Hit FM Top 100. To further promote the album, she embarked on the Butterfly Campus Tour. However, she distorted her right scapula, strained her thigh muscle, and sprained her right ankle due to over-training at the time. In October 2009, she released her fifth live album, "Love & Live", which contains the performances from two of her one-off concerts, Butterfly Concert and Slow Life Concert. In October 2009, Tsai extended her business ventures and co-founded her own music production and management company, Eternal, with her manager Ke Fu-hung. In April 2010, Tsai named the ambassador and recorded the theme song, "Heartbeat of Taiwan", for Taiwan Pavilion of Expo 2010.