Bokseongi

A mysterious but friendly creature who helps Geum-Bogi when he gets lost. As it's made of moss, it thrives in moisture and dislikes dry days. It's only active at night and on rainy days. It collects acorns and gives them to Geum-Bogi as a gift, and Geum-Bogi gives it persimmons, which it loves. It also digs up a flower and leaves it on Ui-Gyun's porch, who plants it in a pot. When his doctor see it, he's surprised, telling him it's the rare plant that is used to make the medicine for treating Ui-Gyun's lung problems.