Song Danping, the hero, is a revolutionary during the old democratic revolution and engaged in drama activities. He fell in love with Li, the daughter of the big landlord, but was stopped by the big landlord and framed by Tang Jun, a bully who had long coveted beauty. Tang Jun ordered people to burn his face and hands with nitric acid. Song Danping hid in the top floor of the theater and lied that he was dead. Li went insane after learning about it. Every midnight, Song Danping would hold her head high and sing at the top of the theater. Xiao Xia seemed to be comforted by her singing. Ten years later, another troupe performed in this theater, and Song Danping's Midnight Singing helped this troupe artistically. So by chance, the young actor Sun Xiaoou met Song Danping. Song told Sun in detail about his own experience and showed Sun the ferocious face of being burned, which aroused Sun's strong indignation and resonance. Song Danping and Sun Xiaoou became close friends.

After another three years, due to the long-term lack of improvement in the repertoire, the troupe was devastated and faced with dissolution. When Xiao Ou said goodbye to Song Danping, Song took out the script of "Hot Blood" that had already been revised, and promised that the troupe would definitely bring it back to life. Soon, the troupe achieved great success with blood, and Xiao Ou thanked Song Danping. Song asked Xiao Ou to look at what he had missed for a long time instead of himself. Xiao Ou refused, inadvertently revealing that his sweetheart was a troupe actor, the Green Butterfly. Danping was disappointed after hearing this, and frankly hoped that Xiao Ou would take over and bring happiness to Xiao Xia. Xiaoou was moved by Danping's true feelings and promised to pretend to see Xiao Xia. Xiao Xia was overjoyed to see "Danping" return, and his mental outlook was brand-new, but his mind was still not back to normal. A few days later, Tang Jun, the bully who killed Song Danping thirteen years ago, coveted the beauty of the actress Green Butterfly in the theater and chased her backstage to be his concubine. Green Butterfly sternly refused, pointing out that she only belongs to Sun Xiaoou. Tang also insulted the blue butterfly, and Xiao Ou wrestled with Tang, and the soup was overwhelming. She got angry and pulled out her pistol. In order to protect her boyfriend, Green Butterfly was shot in the abdomen and immediately fell to the ground and died. The gunfire alarmed Song Danping who was hiding on the top floor. Song, wearing a black cloak, immediately jumped from the upstairs and fought fiercely with Tang Jun, and Tang was forced into the top floor. Dan Ping confessed his identity: "I am Song Danping who was harmed by you thirteen years ago." Tang was frightened by Song's ferocious face. After several rounds, he fell from the top floor and died.

Fierce fighting and gunfire attracted a large number of people to watch. When people saw Song Danping's ferocious face, they all mistakenly thought that there was a monster, ready to kill Song Danping. Sun Xiaoou failed to persuade loudly, and revealed that Danping was a revolutionary before, which led to the intervention of the military and police. Song Danping fled at the sound and was trapped in an abandoned second floor by a large number of citizens and military police. At this critical moment, Sun Xiaoou resolutely found Xiao Xia, confessed to pretending to be Danping a few days ago, and told Xiao Xia that Danping had been waiting for her silently for thirteen years, and this time it must be impossible to live. Xiao Xia suddenly fainted.

Danping was trapped on the second floor and couldn't get away. Citizens and gendarmes are afraid of her ferocious face and dare not approach. Throwing torches into the building, the whole building suddenly caught fire. Danping couldn't stand the fire, almost fainted and couldn't leave. Thinking that she had avenged herself, she calmly threw herself into the river at the edge of the building. At this time, Xiaoou has been waiting for Xiao Xia. A few hours later, Xiao Xia woke up, only to find that her spirit miraculously returned to normal. She just said, "It feels like a long dream." Seeing this situation, Xiao Ou thinks that her lover has passed away, and decides to start a happy life with Xiao Xia as Dan Ping.