WJSN made their official debut on February 25, 2016 with the album Would You Like? and with only twelve members.
On July 11 of 2016, after Produce 101 Season 1, they added Yu Yeonjung as a new official member of the group.
There are 4 different units of WJSN: Wonder, Joy, Sweet, and Natural. Yeojung is part of the Natural unit.
On August 17th, 2016 WJSN had their first comeback with 13 members, with Mini-Album The Secret and its title track Secret. Their comeback stage was on August 18th on M!Countdown with Bebe as the B-track.
On January 4th, 2017 WJSN has their 2nd comeback with EP From WJSN and its title track I Wish. Their comeback stage was on January 5th on M!Countdown with Say Yes as the B-Track.
In September, 2018, it was revealed that members Xuan Yi, Mei Qi, and Cheng Xiao would not participate in WJ Please? promotions due to conflicting overseas schedules in China.
Starship confirmed on January 24, 2019 that the group would continue to promote with 10 members for the foreseeable future due to Xuan Yi, Mei Qi, and Cheng Xiao's ongoing activities in China.
