Nancy auditioned in Korea's Got Talent as part of a hip-hop group called "Cutie Pies" in 2011, The group reached the semi-finals.
As a teenager, she appeared in several TV programs, including The Unlimited, and also participated in Mak Ee Rae Show: Just Do It Expedition in 2012, in which she traveled to the Philippines and Saipan with South Korean actress Kim Yoo-jung.
2016: Finding Momoland, debut with Momoland, and Sunny Girls
Main article: Momoland
Nancy in 2016
In 2016, Nancy became a contestant on Mnet's reality survival show Finding Momoland to select the members of MLD Entertainment's new girl group Momoland. She finished the competition in first place, and had her debut with the group on November 10, 2016, with the mini-album Welcome to Momoland. Momoland made their debut stage performing at M Countdown,
On November 19, it was announced that she would join Inkigayo's project girl group Sunny Girls along with GFriend's Eunha, WJSN's Cheng Xiao, Oh My Girl's YooA and Gugudan's Nayoung. They made their official debut at SBS's Inkigayo stage, on November 27, with the title track "Taxi". The group also performed at the 2016 SBS Gayo Daejeon on December 26.
2017–present: Acting activities and recognition
In April 2017, Momoland released the single "Wonderful Love". On August 22, 2017, Momoland's second mini-album, Freeze! was released. In the same year, Nancy was cast in the lead role with boy band ZE:A member Ha Min-woo in Naver TV's web music drama series Some Light. Nancy and Ha Min-woo also collaborated for the theme song of the drama series.
In October 2018, Nancy appeared in episode 11 of MBC's Dae Jang Geum is Watching, alongside her fellow-members JooE, Hyebin and Daisy as idol trainees.
On January 3, 2018, Momoland released their third mini-album, Great!. As a result, the lead single, "Bboom Bboom," was a huge commercial success, reaching number two on the Gaon Digital Chart. On June 26, 2018, Momoland released their fourth mini-album Fun to the World with the lead single "Baam" becoming the 15th best-selling song of July 2018 on Gaon Music Chart.
In the Philippines, ABS-CBN and Dreamscape Entertainment announced on October 4, 2019, that Nancy was to star in an upcoming new Filipino miniseries titled The Soulmate Project. Nancy will play her character Binna, a "Korean-American who lives in the Philippines." In an interview with ABS-CBN News in 2019, director and writer Antoinette Jadaone said that series will consist of 13 episodes and it will be "more akin to a Korean drama." she said, "It’s not like how we do teleseryes [in the Philippines] where you do it per script every day, with a weekly script," Nancy revealed that filming will also take part in her home country South Korea. Production for the project was slated to begin in 2020, but was postponed to 2021 due to the COVID-19 pandemic and the ABS-CBN shutdown and subsequent denial of its bid for a new legislative broadcast franchise. An omnibus trailer for the series was unveiled at the network's Christmas special on December 20, 2020, while new filming dates are yet to be released.