Yoon Na-mu is Geu-ru's best friend and neighbour who joins and helps him run Move to Heaven after she becomes suspicious of Sang-gu's sudden presence in Geu-ru's life. However, her mother disapproves of her working as a trauma cleaner, so she does so in secret.
She has been fond and protective of Geu-ru since they first met when they were kids and is willing to take good care of him.
