The group consists of six members: Daehyeon, Donghan, Yongha, Yohan, Seokhwa, and Junseo.

[1] Daehyeon and Donghan were contestants on the Mnet reality survival show Produce 101 Season 2.

[6] Yongha and Junseo were contestants in Under Nineteen and both became members of the debut lineup, finishing in 6th and 9th place respectively.

[12] The group was announced in May 2020 by Oui Entertainment, through individual profile videos, under the temporary name OUIBOYS.

[20] The group visited 15 cities in 6 countries, including Thailand, Japan, the United States of America, Canada, Mexico, and Chile.

[21] On August 11, WEi made their Japanese debut with the mini album Youth and its lead single "Maldives".

[24] On December 10, WEi held a two-day fan concert Merry RUi Day, along with releasing a special Christmas album Gift For You.

[26] The group visited 10 cities in 5 countries, including Japan, England, Germany, the United States of America, and Mexico.

[31] On December 6, it was announced that WEi will make a comeback on January 15, 2025 with their seventh EP The Feelings, marking 1 year and 7 months since their last extended play.