[10] In pursuing her path to become a singer, Moonbyul attended 11 auditions, signed trainee contracts with at least three agencies, and also fell victim to scams by fake entertainment companies.

According to the group's WAW documentary, Moonbyul also specialized in freestyle dance and hip-hop, and would show up to monthly evaluations with self-made routines she choreographed herself.

They put a creative twist on their song "Decalcomanie" by including adlibs that referenced famous quotes and well-known lines from popular movies that year.

As a result, the group and their song "Decalcomanie" gained a surge in popularity and rose to the top of real-time music charts, becoming a hit domestically.

[23] Billboard commended the release for continuing Mamamoo's legacy of relaying different ideas of feminine strength through their music, adding praise to Moonbyul for being "bold in both sound and style, showing off her fierce duality as both a singer and rapper".

Its lead single "Eclipse" also peaked at number fourteen on Billboard World Digital Song Sales chart for the week of February 14, 2020.

[31] Upon garnering high broadcast ratings, she launched Studio Moon Night, her own flagship talk show, on February 15, 2021.

In May of the same year, Moonbyul was awarded at 2022 Korea Brand Customer Loyalty Index for her work as a host in the live broadcasting category.

Moonbyul scored her first ever goal on the August 24th, 2022 episode to help her team FC Top Girl advance to the Super League, which recorded the highest viewership ratings of 9.6% per minute.

[41] On April 28, 2022, she released her fifth EP, C.I.T.T (Cheese in the Trap),[42] containing punk rock lead single of the same name, as well as acoustic R&B track "My Moon", self-composed by Moonbyul as a song for her fans.

[45] From August to November 2022, Moonbyul participated in and won the JTBC survival program The Second World, in which rappers from leading K-pop girl groups competed in a full-scale vocal battle.

[49][50] Ultimately, she took first place in the finale and the phrase "어우문" (acronym of "Moonbyul is going to win anyway") was coined to describe her unbeatable dominance throughout the show's run.

[55] Moonbyul joined the judging panel of JTBC's boy group survival program Peak Time in February 2023, replacing Mino of Winner.

[56] On April 29, Moonbyul was invited to perform at the Japanese edition of the Chimac Festival, held at the Expo Commemoration Park in Osaka, Japan.

[60] Moonbyul embarked on her first solo world tour, Museum: An Epic of Starlit with shows in Seoul, Taipei, Singapore, Hong Kong, Kaohsiung, Osaka, Tokyo and Macau.

[61] In April 2023, Moonbyul donated ₩10 million to Miral Welfare Foundation to sponsor emergency medical expenses for children with disabilities in urgent need of treatment and surgery.

She also lent her voice to the narration of MBC's documentary program Miracle in Spring, which highlights the struggles of these children who suffer from illness and financial difficulty.