隔壁女孩Phai, who was raised by a single mother, one day finds a black onyx ring hidden deep among mother’s clothes. The ring became an important puzzle peice sparking a need to uncover the truth about her father, whom she’s never met or known anything about. With her best friend and shadow Ton by her side to support her, Phai sets off on a journey full of questions and uncertainty. Along the way, they meet Mengla, a man who'd also grown up with the sense of his father's absence.Drawn together by similar pasts, the three begin piecing together clues that lead them to the Mon Bridge. What starts as a search driven by frustration and confusion slowly becomes a journey of growth. Through it, Phai begins to understand what family means, how to let go of resentment, and what it truly means to live with purpose.