Agent J (Chinese: 特務J) is the ninth studio album by Taiwanese singer Jolin Tsai, released on September 21, 2007, by EMI and Mars.

While it was praised for Tsai's bold experimentation and diverse musical styles,[3] some critics felt it lacked freshness and memorable melodies.

[8] The album was released in conjunction with a film of the same name, which was co-directed by Jeff Chang, Marlboro Lai, and Kuang Sheng.

It was reported that her new album would be released between August and September 2007, and that Lars Quang, who had worked on Dancing Diva, had written three new songs for Tsai's upcoming project.

[20] On July 9, 2007, it was reported that Tsai and actor Kim Jae-won filmed a music video for a track on the new album in Paris.

[21] On August 8, 2007, Universal Music announced it had invested NT$50 million to produce an 80-minute film to accompany the album.

[9] On September 4, 2007, it was revealed that the album would include four songs written by Malaysian composers: "Agent J", "Alone", "Ideal State", and "Priceless".

EMI Greater China's General Manager, Sam Chen, responded by stating that the IFPI in Taiwan had launched a special investigation into the leak and would pursue legal action against those who uploaded, downloaded, or exchanged the songs.

"[23] The lead single, "Agent J", is a high-energy dance track with a dramatic flair, enhanced by the sound of high heels in the introduction.

"Fear-Free" is a 3/4-time swing ballad, with clear and pure piano melodies guiding the listener into a warm, nostalgic emotional state.

"Metronome" is a self-penned song by Tsai, with lyrics reflecting an inner strength and competitiveness, while the piano and string arrangements evoke a subtle sense of melancholy.

"Golden Triangle" blends brass and percussion, taking the listener on an exploration of love's mysterious and enigmatic qualities.

[24] The album cover features Tsai wearing a black, low-cut, backless leather jacket and knee-high boots, designed by Natsuko Kawabe.

[29] Upon its release on September 28, the album quickly topped the weekly sales charts at major Taiwanese record chains, including G-Music and Five Music.

[34] On December 7, the "Special Celebration Edition" was released, which featured a live performance from the Agent J Concert and an additional music video.

[39] On October 24, 2007, she participated in the opening ceremony of the 16th China Golden Rooster and Hundred Flowers Film Festival, performing "Agent J" at the event.

[42] That same day, Tsai also participated in the New Year's Eve Concert in Taipei, where she performed "Tacit Violence", "Fear-Free", and "Sun Will Never Set".

[44] The following day, January 10, 2008, she participated in the Love from the Strait variety show on Southeast TV, performing "Agent J", "Alone", "Ideal State", "Sun Will Never Set", "Fear-Free", and "Bravo Lover".

The silk required a sense of unity, while the pole was rigid and couldn't be controlled by brute force; I had to learn how to master it!

The album successfully highlights Jolin's sensual and passionate qualities, and the lyrics capture the modern female mindset.

Jolin's ability to handle slower songs shows marked improvement, but the dance tracks seem more focused on external glamor and physical performance.

It's a surprising shift for a character meant to exude toughness, more suited to a film like Lust, Caution, where emotional ballads capture betrayal in a delicate, drawn-out manner.

"[62] DJ Luo Yi of ERS Chinese Top Ten remarked, "The album maintains the overall standard of Dancing Diva and brings an upbeat, fashionable set of tracks.

"[4] Musician Qu Shicong commented, "The overall production of the album is of a high standard, especially with the contribution of Danish producers who brought a sense of freshness to three tracks.

However, compared to Dancing Diva, this album is less striking, primarily due to weaker melodies and some disappointing tracks produced by Paul Lee, which lack the energy that Jolin is known for.

"[4] Tencent Entertainment's critic Shu Wa noted, "The album largely matches the 'agent' image, with many tracks fitting this persona.

"[7] ERC Chinese Top Ten DJ Li Xin commented, "Once again, with Adia's collaboration, we see familiar fast and slow songs.

"[4] Global Chinese Music Chart DJ Zhu Yun said, "The album is flashy and lively, with an average level of song quality.

While this approach has earned her a large fanbase and solidified her as a trendsetter, it also means the era of highly impressive albums like Magic is gone.

[75] On July 5, 2008, Adia and Andrew Chen won the Best Single Producer and Best Music Arrangement at the 19th Golden Melody Awards for their work on "Agent J".