Ok i know you all are going to be like woah woah chill out Sherly this is too advanced.. BUT I PROMISE it's useful and not as hard of a term as it looks!! π
μμ λΆμ is actually an idiom (so we can't really break it down) but it means to be fidgety, restless, can't stay still.
You would usually use this to describe someone who seems really anxious and that's why they physically cannot stay still! In this case, theyre using it with the word λͺ©μ리 (voice) which means anxious/jittery voice!
Hope that makes sense! β€οΈ
(i thought it was time to be more advanced bc you're all so good at Korean now heheeheh~)