In April 2018, she made her debut as a solo artist with her digital single "Easy", peaking at number three in South Korea.

[3] In 2021, Wheein released her debut EP Redd, which peaked inside the top ten in Korea.

[6] She had first appeared in the group's first R&B collaboration "Don't Be Happy", alongside member Solar and featuring Korean singer Bumkey, that January.

[8][9] On April 17, 2018, Wheein debuted as a solo artist by releasing her first single album magnolia with the lead single "Easy" featuring rapper Sik-K.[10] In 2019, she went on to feature in a few more tracks with artists including DinDin, Park Bom and also collaborated on a song with Kim Hyun-chul.

"[3] Wheein's first physical release, Soar peaked at number four on the Gaon Album Chart, selling over 23,000 copies in 2019.

[13] The single "Good Bye" debuted on the Billboard World Digital Song Sales chart at position 24.

[15] She featured on a track again for DinDin in May, for Peakboy in August, for Jvde Milez in September and for Basick in December.

[23] On June 11, 2021, Wheein decided not to renew her exclusive contract with RBW, but instead signed a deal with the company allowing her to promote with Mamamoo for at least 2 more years.

[27] On November 28, she released another soundtrack titled "Ice Cream Love" for the Coupang Play drama One Ordinary Day.

[32] On February 13, 2022, Wheein released a re-interpretation of The Stray's song "You, You", as a soundtrack for the webtoon Nth Romance.

[43] She stated that her previous EP WHEE and the album IN the mood are two parts of her project based on her Instagram ID, "whee_inthemood".

[48] The Asian leg of her tour commenced on March 26, with a show in Hong Kong followed by concerts in Bangkok, Manila, Taipei and Tokyo.

[50] Her Europe and USA leg of the tour was held from May 9 to June 4 with shows in Warsaw, Helsinki, Tilburg, San Francisco, Los Angeles, Dallas, Houston, Orlando, Fort Lauderdale, Washington D.C. and Brooklyn.