[7] Beginning late 2019, Minhyuk began expanding his individual activities,[8] including being part of the three MCs for SBS' Inkigayo, alongside Naeun of April and Jaehyun of NCT 127, hosting the show weekly every Sunday, starting in October.

The show focused on the "makeover" of neighborhoods across the country,[26] as well as returning for the second season of Back to the Idol, which began airing in mid-August, with Eunhyuk.

[32][33] On October 14, he and Leeseo of Ive attended the Häagen-Dazs' special exhibition "Melting Point", in collaboration with Lotte Department Store, held in Seoul.

[42] On October 6 to 10, he performed in the Ground Forces Festival (also known as Army Fest), held in Gyeryong, South Chungcheong Province.

[40] He had cited Junsu of JYJ, Kyuhyun of Super Junior, Yoseob of Highlight, and Mino of Winner as his role models.

[50] In November 2021, as part of Monsta X's promotional campaign for traditional Korean culture, Minhyuk and Hyungwon participated in a video narration for the YouTube series Kimchi Universe 3, jointly produced by Daesang Jonggajib and World Kimchi Research Institute together with Professor Seo Kyung-duk of Sungshin Women's University.

[54] In 2023, Minhyuk held a collaborative exhibition with the street artist Doezny and the PepsiCo's carbonated soft drink brand Mountain Dew.

[55] In July 2021, he was selected as the global ambassador by the French premium mineral water brand Evian through the fashion magazine Esquire Korea.

[56] On July 16, Minhyuk and Shownu also appeared in the fashion magazine W Korea, promoting the German premium luggage brand Rimowa.

[58] In February 2022, Minhyuk became one of the faces of the Korean cosmetics and skincare brand Olive Young's Vegan Beauty campaign, alongside group member Joohoney and his labelmate Liz of Ive.

[64] In March 2023, he posted several photos of the American luxury jewelry brand and specialty design house Tiffany & Co. through the fashion magazine Esquire Korea's Instagram.

[69] In October 2022, Minhyuk, alongside celebrities such as Park Bo-gum, Jung Hae-in, and Lee Se-young, agreed to wear grandma's handicraft brand Marco Roho's products such as rings and bracelets, which also advocates a social lifestyle brand, starting with the purpose of creating sustainable jobs for elderly women, who have reduced social participation, as well as having difficulties in becoming economically independent.

[70] The same month, he participated in the fashion magazine W Korea's breast cancer awareness campaign "Love Your W" charity event, alongside his group member Hyungwon.

[71] In March 2023, Minhyuk participated in a charity auction of his cherished items, from paintings, custom bags, and rings, and all the proceeds will be donated.

[72] In October 2024, he participated in the fashion magazine W Korea's breast cancer awareness campaign "Love Your W" charity event, alongside his group member Shownu.