A code hidden in the music notebook.

Episode 21:
The Lumen massacre in its bloody colors. The spy driver was there. Hong Mei and the 2 police officers want to know more about the ghost owl. Dan Yang and the team of experts look for solutions in the submarine design. Dan Yang is informed that Bai Hui hasn't been to the hospital for a week and may be sick. A female healer (a spy) talks to Mister Bai. Hong Mei and Dan Yang will bring a happy moment to Bai Hui who is sick. Hong Mei asks Mister Bai if he knows anything about the ghost owl. Dan Yang is terrible at cooking, Hong Mei helps him. Hong Mei suspects something when looking at Bai Hui's music notebook. Hong Mei thinks Dan Yang wants her to get sick so he can take care of her. Mister Bai observes his daughter's suspicious behavior and finds some documents hidden inside a secret compartment in a sharp object. Mister Bai notices something strange in the song lyrics that he found in his daughter's things. Director Ge announces that there will be a new nurse. Director Chu advises Lu Cheng about his romantic desires with Bai Hui, and that the work is being harmed. Dan Yang and the entire team are concerned about the complexity and weight of the submarine's stabilizer and he explains that it is also very expensive. Dan Yang and the experts discuss worriedly. Bai Hui goes to Lu Cheng and apologizes to him. Experts are congratulated on the completion of one of the submarine's parts, in the shape of a sphere, weighing 4 tons. The piece breaks away and spins dangerously over them, hitting Captain Chen, who was taken to the hospital and received a blood donation from a colleague. The team of investigators discovers sabotage in the ropes that held the sphere that came loose. Her colleagues tease Bai Hui for still working hard after donating blood. Dan Yang and Specialist He are exasperated by what remains to be done in progressing the submarine project.

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