After a seven-year stint in juvenile detention for a fatal fencing accident, former champion Zihan returns home, disrupting the lives of his brother Zijie and their nightclub singer mother, Ai Ling, who wants nothing to do with him. While Ai Ling sees Zihan as a danger, Zijie believes in his innocence and seeks him out for fencing lessons. As Zihan's teaching increasingly blurs skill with deception, Zijie begins to question his trust. Haunted by a long-suppressed childhood trauma, Zijie faces the tenuous line between loyalty and doubt. (CiLENS)