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.

阿凡（余文乐饰）自小便没有了父母，为了生活与好友阿明（黄又南饰）在戏院门口卖蔗。一天他们看到在街头上大打狮鼓的阿蓝（蔡卓妍饰）。阿明对阿蓝一见钟情，决定与阿凡一起到阿蓝父亲（葛民辉饰）的武馆以学艺为名接近阿蓝，阿蓝却对阿凡有意，阿凡决定成全好朋友，渐渐与阿蓝生疏了。在一个丧礼上，阿凡遇到了一个从小在尼姑庵长大的女孩——“灭绝师太“（钟欣桐饰），阿凡被她的美貌深深吸引，每天都偷偷跟着她到山上去。女孩终于发现了他，并对他产生了情愫，想让阿凡带她走出尼姑庵，去看看那个多彩的世界，出走后，便从此消失于阿凡的身边。阿明利用老电影的剧本，得到了阿蓝的欢心，可是阿凡心里还是念念不忘他的“灭绝师太”。