[9] On 16 September 2021, Jeonghan released a digital song named "Dream" in both Korean and Japanese, written and produced by himself and regular Seventeen collaborator Prismfilter.

[10] In March 2022, Jeonghan released a cover of Japanese musician Mosawo's "Aitai" as a part of Seventeen's ongoing #17Studio series.

[11] In April, Jeonghan was announced as a new presenter of Tokyo FM's School of Lock program, a weekly radio show featuring musicians aiming to "hold the key to the future".

It was stated that he would continue participating in the group's scheduled activities, such as Seventeen's Be The Sun World Tour while wearing a cast and brace, and would also receive ongoing medical consultations.

[14] In 2023, Jeonghan and bandmate Dino were cast in MBC every1's reality show Magic Lamp (요술램프) alongside Kim Jae-joong, Kang Hui, Lee Joo-ahn, Junpi, and Tan.

[16] On 14 December 2023, Pledis announced that Jeonghan underwent ankle surgery and would be absent from the group's Follow Tour and scheduled activities.

[26] On 4 September 2023, Jeonghan was chosen as the new global ambassador for South Korean clothing brand Acme De La Vie.

[34] Jeonghan was featured on the cover of the September 2024 edition of South Korean men's magazine Man Noblesse in collaboration with Swiss luxury watchmaker Hublot.

[35] In October that year, Jeonghan was featured in Paul Smith's 'Season of Fun and Games' campaign as part of the Fall/Winter holiday collection.