As of today, NMIXX stands as the group who has sent the most members to LeeMujin Service, the KBS-run variety show that focuses on featuring solo vocalist prowess. The elder 4 members have all gone, one with each comeback, and the younger two members are preparing for their turn as well, in future comebacks.
Lily singing DICE (NMIXX), Psycho (Red Velvet), snippet of Hello (Adele), Butter (BTS), and How can I love the heartbreak (AKMU):
Haewon singing Love Me Like This (NMIXX), I Got Lucky (Kwon Jin-ah), snippet of Demons (Imagine Dragons), snippet of MIROH (Stray Kids), 0310 (Baek Yerin), Medley challenge of Lee Mujin / IVE / NewJeans / Baek Yerin / BTS / Adam Levine / ENHYPEN / George / Beyonce, and Dream (Baekhyun & Suzy):
Sullyoon singing Roller Coaster (NMIXX), Waiting (YOUNHA), high-note challenge with Let's Say Goodbye (Parc Jaejung), Joke's on You (Charlotte Lawrence), snippet of Singing Got Better (AILEE), and Perhaps Love [Goong OST] (HowL & J):
Bae singing DASH (NMIXX), I'm a Mess (Bebe Rexha), snippet of Only Want to Give it to You (Elle Varner), Wi Ing Wi Ing (HYUKOH), Intro Medley challenge with SIA / La La Land / Adele, and I Love You (2NE1):
Honestly, just like MAMAMOO in the 3rd gen went to Immortal Songs 2 as the vocally-challenging variety show to kickstart promotions for their songs, it feels like LeeMujin Service and It's Live play the same role for NMIXX in the 4th gen.