WEi (위아이) is a six-member South Korean boy group formed by Oui Entertainment, consisting of Jang Dae-hyeon, Kim Dong-han, Yoo Yong-ha, Kim Yo-han, Kang Seok-hwa, and Kim Jun-seo. The group officially debuted on October 5, 2020, with their first mini-album Identity: First Sight and its title track “TWILIGHT.”

Before coming together as WEi, each member had previous experience in the K-pop industry—Dae-hyeon and Dong-han both participated in Produce 101 Season 2, with Dae-hyeon debuting in RAINZ and Dong-han in JBJ before going solo. Yong-ha and Jun-seo came from the survival show Under Nineteen, later debuting in 1THE9, while Seok-hwa appeared on both YG Treasure Box and Produce X 101. Yo-han rose to fame by winning Produce X 101 and debuted with X1.

Since debuting, WEi has released a string of mini-albums exploring various themes, including their Identity trilogy, the emotionally rich Love Pt. series, and their 2025 mini-album The Feelings, which features the introspective title track “NOT ENOUGH.” Known for blending musical versatility with emotional depth, WEi has steadily built a dedicated fanbase called RUi, symbolizing the close connection between the group and their fans.