When antique restorer Xie Xun's fingertips touch ancient paintings, criminal profiler Lu Shiyan's eyes are locked on the case file, and they are simultaneously involved in the "echo theater" composed of "unresolved criminal obsessions".
Xie Xun can trace the remains of the murder fragments, but he can easily fall into the empathy of the victims; Lu Shiyan can deconstruct the logic of the suspect's behavior, but he is often wrapped up in the murderer's thinking. This pair of strong partners who are forced to be bound need to use the complementary model of "physical evidence tracing + psychological profiling" to piece together the truth of the unresolved case in the mystery of drowning in the calligraphy and painting shop of the Republic of China, the secret room murder case in the Rainstorm B&B, and the inheritance conspiracy of the circular funeral.
Behind the copy is Xie Xun's slandered case of cultural relic theft, Lu Shiyan's wrongful accusation of profiling, and the "theatre mastermind" who controls everything. Every time they break a copy, they are one step closer to clearing the past and uncovering the real culprit - but the rules of the theater are cold: trust is a sharp blade, empathy is a trap, and even each other's alliances may be a carefully woven web of crime.
When the ink marks of ancient paintings overlap with urban neon lights, when the ghosts of the Republic of China interweave with the shadows of modern crime, this infinite game of chasing the murderer has just begun.
