Sweety is a Mandopop band from Taiwan, a duo consisting of Esther Liu (Chinese: ???; pinyin: Li? P?ny?n; colloquially known as ?? Yan Yan) (born August 8, 1988) and Joanne Tseng (sometimes transliterated as Joanne Zeng or Joanne Zheng; Chinese: ???-?; pinyin: Z?ng Zh?qi?o; colloquially known as ?-??-? Chiao Chiao) (born November 17, 1988).