[14] She was also featured in spreads for the Korean editions of magazines such as Vogue, Elle, and W before signing with The Society Management and leaving South Korea in 2016 to pursue a career overseas.

[13][19] After her booking to walk as an exclusive for Alexander Wang was canceled, she made her international runway debut in September 2016 at Opening Ceremony's S/S 2017 show at New York Fashion Week.

[9] Shortly after, she walked in shows for Marc Jacobs, Alberta Ferretti, Chanel, Max Mara, and Fendi; appeared in Harper's Bazaar, Love, and W; and was featured in campaigns for Sephora and Gap.

[20][21][13] Also in 2016, she made her Paris Fashion Week runway debut as an exclusive model for Louis Vuitton at their S/S 2017 show, selected by Nicolas Ghesquière and casting director Ashley Brokaw.

[25] Jung has walked in runways for Burberry, Miu Miu, Jason Wu, Chanel, Schiaparelli, Giambattista Valli, Bottega Veneta, Emilio Pucci,[26] Prabal Gurung, Jacquemus, Gabriela Hearst,[27] Moschino, Oscar de la Renta, Roberto Cavalli,[28] Jeremy Scott, Tory Burch,[29] Jean-Paul Gaultier, Acne Studios,[30] Brandon Maxwell,[31] Gucci,[10] Lanvin, and Zuhair Murad.

[35][36] Jung appeared in a promotional video for Pharrell and Chanel's collaborative capsule collection in March 2019.

[23] One month after signing with Saram, she was given three scenes from the show's script, and auditioned for the role via video while in New York for Fashion Week.

[27][44][45] Sae-byeok became a fan favorite, and Jung was called Squid Game's breakout star by critics.

[49] She was also nominated along with her costars for the Screen Actors Guild Award for Outstanding Performance by an Ensemble in a Drama Series.

[53] In 2024, she made a cameo in the comedy mystery Chicken Nugget as Hong Cha, a renowned food blogger.

[35] On November 26, 2024, both Lee and Jung's agencies released a joint statement saying that the two have decided to part ways after nine years of dating.