[6] In 2019, I.N made his acting debut with a cameo appearance in the final episode of the web series A-Teen 2, alongside fellow Stray Kids member Hyunjin.

[10][11] On 15 January 2021, I.N released his debut solo song, "Maknae on Top", through the SKZ-Player series, featuring fellow bandmates Bang Chan and Changbin.

[13] In October, he again collaborated with Seungmin to release the song "Can't Stop", which was featured on the group's seventh EP, Maxident.

[14][15] Additionally, during Stray Kids' Maniac World Tour, he collaborated with fellow member Lee Know to perform a cover of Harry Styles' song "Falling".

[20] In September, he made his debut at Milan Fashion Week by attending the Bottega Veneta spring 2025 show, where he sat front row alongside A$AP Rocky and Kendall Jenner.

The donation he made will be used to cover the treatment costs for children with cancer from underprivileged families who are being treated at Samsung Medical Center.