In the 2003 television drama, "Hi Working Girl", Tsai played the title role of Fu I-ling. After its release, the television drama received mixed reviews. The same year, she graduated from Fu Jen Catholic University and received her bachelor's degree in English literature; She was later elected as a recipient of the Excellent Alumni Award in 2011. In February 2004, Tsai's sixth studio album, "Castle", was released. She received positive feedback for the album, and it sold more than 2 million copies in Asia, with more than 300,000 copies sold in Taiwan alone, and became the best-selling album by a female artist of the year in Taiwan. Two hit tracks, "It's Love" and "36 Tricks of Love", reached number eight and seventy-eight on the Hit FM Top 100 Singles of the Year. Tsai received an MTV Asia Award nomination for Favorite Artist Taiwan. She was also nominated for an MTV Video Music Award Japan for Best Buzz Asia for the music video of "Pirates". Beginning in August 2004, Tsai embarked on her first concert tour, J1 World Tour. In December 2004, Tsai released her second remix album, "J9", which contains the Hit FM Top 100 number sixty-one hit, "Signature Gesture". In February 2005, she performed "36 Tricks of Love" at the CCTV New Year's Gala. In March 2005, she signed with a contract with publisher YuanShen to be the author of a series of English reference books. The first release of these books, "Jolin's English Diary Book", sold more than 1 million copies in Asia, with more than 250,000 copies sold in Taiwan alone.