Cai Xukun (born August 2, 1998), better known by the mononym Kun (stylized as KUN), is a Chinese singer-songwriter, dancer, rapper, and actor. He debuted as a member of SWIN and its sub-unit SWIN-S on October 18, 2016, after participating in the first and second seasons of the South Korean-Chinese reality show Super Idol. After leaving the group and its company Yihai Entertainment, he participated in iQiyi's reality survival show Idol Producer, finishing first and debuting as the leader/center of temporary Chinese boy group Nine Percent, on April 6, 2018. He is a cast member of variety show Keep Running.
Most of Kun's solo works are original, including "Wait Wait Wait" and his first EP "1". The EP was a commercial success with every song topping Chinese music charts. "Pull Up", the first track, broke 10 records and peaked at number 1 on four of QQ Music's charts as well as ranking first on Billboard China's V Chart for 8 consecutive weeks. At the time of its release in 2018, "Wait Wait Wait" debuted at number 1 on QQ Music's New Song list and Popular Music list for 10 weeks and won the title of Asia's hottest song for 4 consecutive weeks.
On January 10, 2019, Kun was officially named China's and Jamaica's Goodwill Ambassador and Outstanding Young Leader by the Jamaican Embassy in Shanghai, China. In February, Kun announced his first solo tour, "Kun ONE North America/U.K. Tour 2019", coming in early April 2019. After he successfully wrapped up his sold-out tour overseas on July 26, Kun released his second EP titled "YOUNG", which consists of two songs, "YOUNG" and "Blindfolded". Upon release, the EP also immediately dominated domestic music charts selling 110,000 copies in a week, dubbing him the "King of Digital Singles" of 2019.