"True Beauty" centers on Lim Ju-kyung, a high school student who faces relentless bullying due to her perceived lack of conventional beauty. Struggling with low self-esteem, she turns to makeup as a transformative tool, mastering it to the point where she becomes unrecognizable to her peers. Her new appearance earns her admiration and popularity, but it also forces her to live a double life, hiding her true self from those around her. This duality becomes increasingly complicated as she navigates friendships, romantic interests, and societal expectations.

The narrative explores Ju-kyung’s relationships with two key characters: Lee Su-ho and Han Seo-jun. Su-ho, a seemingly aloof and handsome classmate, harbors his own emotional struggles, including a strained relationship with his family and unresolved trauma from his past. Despite his reserved demeanor, he becomes drawn to Ju-kyung, sensing her vulnerability and authenticity beneath her makeup. Seo-jun, on the other hand, is a charismatic and rebellious figure who initially clashes with Ju-kyung but gradually develops a deeper connection with her. The love triangle between Ju-kyung, Su-ho, and Seo-jun forms a central conflict, with each character grappling with their insecurities and desires.

As the story progresses, Ju-kyung’s reliance on makeup as a shield begins to unravel, forcing her to confront her fears of rejection and self-worth. Her journey is intertwined with themes of identity, societal beauty standards, and the pressure to conform. The series also delves into the lives of supporting characters, such as Ju-kyung’s best friend, Kang Su-jin, who struggles with her own secrets, and the complexities of high school dynamics, including jealousy, rivalry, and the pursuit of acceptance.

The plot balances moments of humor, romance, and drama, often highlighting the emotional toll of maintaining a facade. Ju-kyung’s growth is marked by her gradual realization that true beauty lies in self-acceptance and authenticity, rather than external appearances. The series concludes with resolutions to the central relationships, though not without challenges and setbacks, emphasizing the importance of honesty and vulnerability in forging meaningful connections.