Yan Zi (Chinese: 燕姿) is the debut album by Singaporean singer Stefanie Sun, released on 9 June 2000, by Warner Music Taiwan.

[7] The Warner producer immediately offered to sign her, however, Sun's father demanded that if she wanted to concentrate on singing, she had to finish college first.

[10] Sun's performance of "Love Certificate" and "Cloudy Day" honestly sings to the depths of simplicity, unlike the kind of gibberish that purposely pretends to be playful, which is a gesture of a singer's maturity.

[11] The undecorated voice whispers in the ear, and the yellowed fragments, the wrinkles of the grandmother, the pain of falling, all flow out with the song and piano accompaniment.

In the start, they wanted Sun to be familiar to the public by getting her to shoot the Chunghwa Telecom Pocket Code advertisement, then they asked her to frequently endorse various activities before the release of the album.

[20] In order to celebrate these sales, Warner Music took advantage of the heat and released a revised version of the album with a limited edition in early August.

[23] The music video for the song "Love Document" was directed by Ma Yizhong and revolves around Sun walking around a loft and outside a window display.

[28] Mathilda of MTVchinese.com awarded the album four stars out of five and commented: "The first hit is impressive, followed by “Love Certificate” which shows another flavor, and the rock in “Turbo”, which is also well-arranged.

"[3] Dong Wen of Sohu Music commented: "In the summer of 2000, Warner finally released its long-brewing secret newcomer, a 22-year-old girl from Singapore named Sun Yanzi.

I was in my sophomore year of high school at the time, and when I grabbed this CD from a girl in my class, I vaguely sensed in my heart the extraordinary nature behind this headstrong voice.

[32] "Cloudy Day" also made it onto the leaderboard of the Taiwan Chinese Musicians Exchange Association's Top Ten "Excellent Singles.