Moonbyul debuted through Mamamoo’s first EP “Hello,” and its lead track “Mr. Ambiguous,” in 2014. She typically raps while the other three members of the group, Solar, Wheein and Hwasa, sing. The group has seen steady success with songs like "Um Oh Ah Yeh" (2015), "You're the best" (2016), "Décalcomanie" (2016), "Yes I am" (2017), "Starry Night" (2018), "Egotistic" (2018), "Gogobebe" (2019), "Hip" (2019) and "Aya" (2020). Moonbyul has also ventured out as a solo singer since 2018, releasing songs like “Selfish” (2018), “Weird Day” (2020), “Eclipse” (2020), “Absence” (2020), “Lunatic” (2022) and “C.I.I.T (Cheese in the Trap)” (2022).