1936, Shanghai.
After an experimental accident, Yu Chizhao, a professor of criminal investigation psychology, traveled to Shanghai on the eve of the Anti-Japanese War.
He discovered that he had a "curse" that could not be turned off - if he looked at someone for three seconds, he could hear the deepest voice in the other person's heart. The Japanese spies in the interrogation room were thinking, "I hid that list..."; The smiling faces of their military commander colleagues were thinking, "This person is too dangerous and should be eliminated..."; The underground party members who united against Japan were thinking, "Can he believe it?"
This ability makes him a terrifying "lie detection machine" within the military, and it also allows him to live in a noisy hell of countless secrets every day.
He gave himself a code name - Echo. Listen to all sounds in the darkness, but only send out the only echo in the most important direction.
But when Shinichi Sasaki, the head of Japan's Super High School, set his sights on him, what came to his mind was actually——
"He can hear it too, right?"
Yu Chizhao knew for the first time: there was a second "heart thief" in this world.
