Kim Na-young was revealed as a member of Jellyfish Entertainment's upcoming girl group on June 10, 2016, with stage name Nayoung.

[14] In June 2018, Nayoung joined the second subunit of Gugudan with fellow Produce 101 alumni members Mina and Sejeong.

[16][17][18] On September 19, Gugudan made their official debut in Japan with the release of their first Japanese single, "Stand By."

[21][22] The end of the promotion period for the mini album was quickly followed by the group's first ever solo concert.

It was held on December 1 and 2 at the Ewha Womans University Auditorium in Seodaemun District, Seoul.

Nayoung expressed her worries about her first theatrical experience but successfully completed the play with the support of fans, fellow actors, and the dedicated Staff.

[25] As Gugudan kicked off the start of their fourth year, the group's number of activities began to decline drastically and they entered their unofficial hiatus era.

[27] On her personal social media account, Nayoung made an announcement regarding the termination of her contract with Jellyfish Entertainment, effective from March 31, 2021.

[28] Following this, she held a solo performance titled "Nayoung's Sweet Summer Day&Night" on June 27, 2021.

It premiered in early 2019, marking the 40th anniversary of the pro-democracy movement, and received high praise as the Les Misérables of Asia.

Kim Na-young passed the audition and acted in the role of Masha, who was saddened by her crushing unrequited love for Treblev.

Kim Na-young successfully passed a highly competitive private audition and was cast in the role of Lee Eun-soo, an art museum docent and curator who fatefully encounters a warm-hearted man named Kim Woo-jin in Seoul.

[34][35] On August 27, 2024, Kim was cast alongside Seo Byeok-jun in the short-form drama My Man's Smartphone (lit.)

[36] positions Gaon (Sunny Girls: Eunha, YooA, Cheng Xiao, Nayoung and Nancy)