In the tender year of 1999, a story unfolds about a selfless teenager whose golden heart sets her on an unexpected journey of observation and discovery. Bo Ra, a vibrant 17-year-old high school student, is someone who radiates positivity and strength. Skilled in taekwondo, she carries herself with a quiet confidence that draws people to her. Beyond her physical prowess, Bo Ra’s spirit shines brightest through her unwavering loyalty and kindness. She's also part of her school’s broadcasting club—a place where creativity meets camaraderie—where she finds herself alongside Woon Ho, another member sharing her passion for storytelling. Bo Ra's closest confidant is Yeon Du, her best friend since childhood. Yeon Du, though soft-spoken, harbors a deep admiration for Hyun Jin, one of the most popular students in their class. Her feelings are both pure and overwhelming, but life takes an unexpected turn when Yeon Du learns she needs heart surgery and must travel abroad to the United States for treatment. Before leaving, Yeon Du entrusts Bo Ra with a heartfelt request: to learn everything there is to know about Hyun Jin, the object of her affection. With this newfound responsibility weighing gently yet profoundly on her shoulders, Bo Ra begins to observe Hyun Jin more closely. At first, it feels like a simple favor—a way to honor her promise to Yeon Du—but as days pass, something shifts within her. Each subtle gesture, every fleeting smile, and even the moments when Hyun Jin seems lost in thought begin to paint a richer portrait of who he truly is. Through her watchful eyes, Bo Ra starts to see not just the surface-level charm that makes him so admired by others, but the layers beneath—the vulnerabilities, dreams, and quiet struggles that make him human. This quiet act of devotion becomes more than a mission; it becomes a bridge connecting two souls, each navigating their own complexities. As Bo Ra delves deeper into understanding Hyun Jin, she realizes how much her friendship with Yeon Du—and now this shared connection—has shaped her own perspective on love, loyalty, and what it means to truly care for someone. (Source: Netflix, AsianWiki) Through these tender threads of friendship, sacrifice, and growing awareness, Bo Ra embarks on a journey that will leave an indelible mark on her heart—one that resonates far beyond the halls of her high school.