Young Maid: Seung-jae, a house owner in his 30s, lives with his nephew Joon-hyeok, but has a hard time doing the chores and so hires a maid. Se-kyeong is an innocent girl who doesn't know much about sex, but she's good with the house work. The two men are excited to have Se-kyeong around and she's happy they are. To Seung-jae, Se-kyeong looks young and innocent, while she appeals as a woman to Joon-hyeok. Seung-jae uses her innocence to teach her things and Joon-hyeok finally makes a video to tell her how her feels about her. Who will Se-kyeong choose?