Kyeong-i, a girl whose hobby is climbing mountains and jumping over walls. She is so intelligent that she can teach herself, with bright eyes and a cheerful personality, she doesn't care about secrets of her birth, living life as if it were a bonus. With a lot of curiosity, she does whatever she wants, even if it means dressing as a boy. The girl, who has lived fearlessly and boldly, gradually becomes a coward in the face of approaching trials, but there is only one person who gives her comfort and courage. Because she has a love she wants to be with for a lifetime, the girl gathers her strength and jumps over the wall again. Iaran: The only daughter of a strict Confucian scholar family. She is petite and delicate but has a strong demeanor like a scholar. Growing up, she felt powerless due to the many restrictions placed on a proper lady. She has lived hiding her emotions and confining herself within the inner quarters, but after meeting a peculiar girl, her heart flutters with gentle affection and crumbles with unexpected farewells. The heart of the woman embracing her young and tender love grows stronger than ever.