True Beauty is a romantic comedy that follows Lim Ju Gyeong, a high school girl who becomes popular after mastering makeup through YouTube tutorials. With her flawless makeup, she transforms into a "goddess" at school—but she’s terrified of anyone seeing her bare face.

Her secret is exposed to Lee Su Ho, the only boy who has seen her without makeup. Though he seems cold and distant due to a painful past, Su Ho is kind and deeply caring. As they grow closer, they begin to share their vulnerabilities and fall in love.

Together, they navigate self-image, acceptance, and the meaning of true beauty. But can Su Ho help Ju Gyeong embrace who she is—beyond the makeup?