Cheng Xiao (Hangul: 성소; Chinese: 程潇, born July 15, 1998) is a Chinese singer based in South Korea and member of South Korean-Chinese girl group Cosmic Girls under Starship Entertainment and Yuehua Entertainment.
Cheng was born on July 15, 1998 in Shenzhen, Guangdong, China. She has a younger sister, Cheng Chen. Cheng studied in Shenzhen Art School, and graduated from School of Performing Arts Seoul in 2016, where she studied under the Department of Practical Dance.
On December 10, 2015, Cheng was revealed as one of the members of Cosmic Girls’ Wonder Unit. On December 21, she released a Christmas cover of “All I Want For Christmas Is You” with Cosmic Girls by Mariah Carey through JuseTV’s YouTube Channel.
Cheng debuted with Cosmic Girls on February 25, 2016, with the release of their debut mini album Would You Like?, including the title tracks “Mo Mo Mo” and “Catch Me”.
In August 2016, Cheng, together with fellow group mates Exy, SeolA, Soobin, Eunseo, Yeoreum, and Dayoung, teamed up with label mate Monsta X to form the unit “Y-Teen”, a project unit group that will be promoting as CF models for KT’s phone fare service.
On September 14, she was proclaimed winner of Pitch King, and on September 15, she won gold for the rhythmic gymnastics segment during the Idol Star Athletics Championships XII.
Cheng along with GFriend’s Eunha, Oh My Girl’s YooA, Gugudan’s Nayoung and Momoland’s Nancy formed a special project group named “Sunny Girls” for Inkigayo’s Music Crush Project. They released their single, “Taxi” on November 27, 2016.
On January 30, 2017, Cheng participated in the Idol Star Athletics Championships XIII, where she won a bronze medal during the rhythmic gymnastics segment.
In 2017, Cheng was a cast member of SBS’ Law of the Jungle.
In 2018, Cheng was a cast member and dance mentor in the reality survival show Idol Producer. The same year, she was cast in her first drama, Legend of Awakening. In November 2018, Cheng released her first solo song “If Love”, an OST for online game Xuanyuan Sword which debuted at #3 in QQ Music.