Na later appeared in two weeks' episodes of Home for Summer, a KBS1 daily drama, and then became a regular of its subsequent series Unasked Family.

[6] Later in March 2021, Na joined the KBS2 historical drama River Where the Moon Rises as its male lead from the 6th episode, replacing Ji Soo who dropped out from the series following bullying allegations made against him.

Despite the last-minute substitutions and casting situations in the ongoing drama, Na's acting and chemistry with lead actress Kim So-hyun were well received by the audience.

[9][10] In July, he was selected as the MC of the web music program OUTNOW Unlimited[a] airing on Playlist, Naver Now.

[11] In July 2023, Na starred as the male lead in the crime drama Longing for You, portraying a police officer who sought revenge for his brother in his quest to capture a serial killer.

[12] In January 2024, Na appeared as the male lead for the fantasy revenge melodrama Marry My Husband alongside Park Min-young (as Kang Ji-won), where he portrays Yoo Ji-hyuk, the marketing manager of U&K Food and Kang Ji-won's biggest ally in her revenge.