[4] After debuting, along with bandmates Changbin and Han, Lee Know enrolled at Gukje Cyber University, studying performance and broadcast entertainment.

After hearing nothing back, he assumed he had failed, but was called a couple years later and was asked to join the company.

[9] Lee Know participated on the survival show Stray Kids and was eliminated on the fourth episode for making an error while rapping.

[10] Ultimately, Lee Know and Felix, who were both eliminated, were allowed to be back and debut with the group in the last episode of the show.

[24][25] Lee Know, along with bandmate Felix, made their New York Fashion Week debut at the Tommy Hilfiger Spring-Summer 2025 show in September 2024 as a guest.

[26] On February 28, 2024, World Vision announced that Lee Know became the youngest person to be inducted into their "Bob Pierce Honor Club" for donating over ₩100 million (US$76,589.47) to the charity.

[31] In September 2023, Lee Know and fellow Stray Kids members Seungmin and Hyunjin were involved in a car accident, causing them to miss their performance at the Global Citizen Festival, though they sustained no serious injuries.