A TV drama about school bullying sparks public panic upon release. The screenwriter, Jing-zhi, becomes a victim of online abuse and falls into depression. For her well-being, Jing-cheng plans to take her abroad, but a tragic car accident leaves him in a coma for three months. Upon waking, he learns the driver received a light sentence and suspects foul play, especially as his parents begin being followed. Realizing the law can’t help him, Jing-cheng forms a vigilante group operating in a legal gray zone called “Dark Fern.” Using cinematic methods, he immerses wrongdoers in scenarios mirroring their victims’ trauma, forcing confessions. His first two cases link back to Jing-zhi’s death and the mysterious demise of actress Xiao-yu’s younger brother, drawing police attention to “Dark Fern.” As Jing-cheng closes in on the truth, he makes a shocking discovery: everything has been part of Jing-zhi’s meticulously orchestrated plan for revenge.