[5][6] After debuting with Iz*One, the group's label Off the Record announced Jang's intentions to complete education via home-schooling in April 2019.

She subsequently left Yonggang Middle School and took the qualification exam,[7] passing with perfect scores in Korean, English, and Mathematics.

[9] From June 15 to August 31, 2018, Jang represented Starship Entertainment alongside An Yu-jin and Cho Ka-hyeon on the girl group survival reality television show Produce 48.

[12] The group's Japanese debut single, "Suki to Iwasetai", was released on February 6, 2019, under UMG's EMI Records subsidiary.

[14] In September 2019, Jang made her runway debut at the 29th Tokyo Girls Collection's 2019 Autumn/Winter fashion festival at Saitama Super Arena.

[17] After Iz*One's disbandment on April 29, 2021, Jang returned to Starship Entertainment as a trainee along with group mate and labelmate An Yu-jin.

[31] A month later, Jang was announced to be the host for the 8th Asia Artist Awards with co-hosts Kang Daniel and Sung Han-bin, which would be held in December of that year.

[34] On November 26, it was announced that Jang would be hosting the 2023 KBS Music Bank Global Festival alongside Rowoon on December 15.

[36] In an interview with Nylon, she stated that the song was inspired by her experiences in the entertainment industry, where women faced hyperscrutiny from media and fans.

[37] In September 2024, Jang was announced to be the host for 9th Asia Artist Awards, which would be held in December of the same year, with co-host Sung Han-bin.

[38] It was also confirmed in November 2024 that Jang would be hosting the 2024 KBS Music Bank Global Festival alongside Zico and Kim Young-dae on December 20.

[40] As a trainee at Starship Entertainment in early 2018, Jang was chosen as a model in a music video sponsored by Pepsi Korea called "Love It Live It", along with YDPP and Park Sun.

[49][50] On July 27, 2021, Amorepacific Corporation announced that Jang was chosen as global ambassador for its natural cosmetics brand Innisfree.

This time, the campaign was revealed by Starship Entertainment as a collaboration between Ive, Cravity, and Oh My Girl for the promotional music video "Blue & Black".