Wu Tongguang found a corner and sat down, in this position it was difficult for others to see him, but he could see the entire courtyard. What's more, the corner is not far from the side door next to it.

The female corner looked as if she had seen Wu Tongguang among the people in the audience. After the gongs and drums dispersed, Wu Tongguang was not in a hurry to get up and leave, until after everyone left, a small man from the theater ran over in small steps and told Wu Tongguang in a low voice: "The play has ended, please come back tomorrow!" ”

Wu Tongguang waved his hand and refused, saying that he wanted to watch the drama of the new team of "Nantian and Beihai".

The little guy's eyes flashed, and he whispered to invite him to the backyard for a while. Wu Tongguang straightened his robe, put on his brimmed hat, and slowly walked into the backyard.

The female character who played Mulan on stage had already taken off her makeup and stood in the courtyard with her back to Wu Tongguang.

The female horn suddenly said: "'Migratory Bird' has been looking up for a long time. ”

Wu Tongguang nodded slightly: "Your surname?" ”

The female horn said: "My surname is Li, and my name is Li Wutong." ”

This person is Wu Tongguang's contact information left in Shang Ji Pharmacy, and he is eager to establish an emergency contact person, codenamed "Wutong".

Li Wutong said: "Hou Bird, you are really much younger than I imagined. ”

Wu Tongguang said: "I have never imagined Comrade Wutong, if you didn't play the drum on stage, I really can't believe you." ”

Li Wutong said: "You recognize me from drumming?" ”

"Yes."

Li Wutong smiled: "It's very interesting, how did you tell from the drumming that it was mine, could it be that your eyes can spell?" ”

"Although there are no spells in my eyes, my ears are still very useful."

"Oh, you're talking about drums?"

"Yes, from the time I came in, you beat the drum twenty-five times with a long voice and thirty-nine times with a short sound of drumming, and converted it into Morse frequency, you can find the corresponding numbers, and each group of numbers corresponds to the position of the four Chinese characters of the password master book that Comrade Shang Qingyuan contacted me, which are 'Wu', 'Tong', and 'stay', 'seat', the first two words are obviously to show your own identity, and the last two words should tell me to stay in my seat and not leave after I leave." Wu Tongguang explained.

Li Wutong's eyes revealed praise: "Yes, it didn't disappoint me." ”

"But how can you be sure that I'm a migratory bird?" Wu Tongguang asked rhetorically.

Li Wutong said: "The one who can translate the words 'stay' and 'seat' from Shang Qingyuan's code mother should not be someone else, if the last one left is not you, who else can it be?" ”

Wu Tongguang smiled and said, "If I didn't hear your drum sound and got up and left with the crowd, wouldn't your method be invalid." ”

Li Wutong was asked without a word.

Wu Tongguang said again: "But as long as I confirm your identity, I will naturally try to meet you, right?" ”

Li Wutong had nothing to say, but she found that the person in front of her was so interesting and even more unsimple.

"Not only that, but I also know that you're going to have people invite me."

"How do you know that?" Li Wutong asked.

Wu Tongguang said: "After you finished hitting the drums of the first two words, the sergeant next to you raised his eyebrows slightly, he obviously didn't know what these drums meant, but then you showed a look. After the end, the little guy who came to invite him, although his makeup had been removed, his posture and pace were exactly the sergeant. ”

Li Wutong was surprised: "You, you just glanced at him?" , can you be sure that he is the sergeant? ”

Wu Tongguang said: "Yes." ”

Li Wutong applauded and said with a smile: "It's amazing, and I really have a great memory." But one thing you should not forget, since you left the joint code of 'Nantian Beihai' in Shang Kee Pharmacy, how could my method be invalid? ”

Wu Tongguang deliberately made things difficult for her, and said: "If I become a traitor after being arrested, I will be the enemy who comes today, and I can naturally use the 'Nantian and Beihai' to connect with you." ”

Li Wutong stared at Wu Tongguang and said, "I'm afraid it's not very easy to catch someone like you. ”

Wu Tongguang said: "But believing is not a very difficult thing, if a person is too careless, it will become an easy thing to catch him." ”

Li Wutong raised his eyebrows: "Besides, I still have confidence in my comrades." ”

Wu Tongguang smiled slightly.

Then she said slowly: "Come again, if you were a traitor, you wouldn't leave here alive today, and it is also one of my tasks to destroy traitors!" ”

Now that the identities of the two parties have been confirmed, Wu Tongguang and Li Wutong began to exchange today's situation, and Li Wutong asked: "I'm curious, what happened to Xiao Guodong's dark arrow you just said?" ”

"Well, the point of the question is not who translates the answer first, but the piece of paper with numbers written on it, and after translating the code, the piece of paper will change color, and the person who changes color is the 'migratory bird'!"

"You may not know how Comrade Lao Shang died, he died of severe poisoning, and his face was red, his eyes were congested, and it was obvious that he had suffered a huge breathing blockage and a sudden increase in heartbeat before he died.

I have been with Lao Shang for a long time, and I also know his psychopharmacology, and he also told me before that there is a reagent extracted from aconitine, which is not only highly toxic after debugging, but also sticks to the skin and clothes for a long time. ”

Li Wutong asked: "Then what does this have to do with the discoloration of the paper?" ”

Wu Tongguang said: "Because the back of the paper is coated with mercury, mercury and this alkaline reagent can produce a chemical reaction!" When I found Lao Shang's body, how could I not go for an examination? I'm bound to touch the residue of the reagent on him. ”

Li Wutong was silent for a while, and then asked: "What does Comrade Lao Shang's pocket watch pointing to eight o'clock represent?" ”

Wu Tongguang made a "eight" figure, and then replied: "Eight o'clock is 8 and 0, and the number 80 in Mendeleev's periodic table is mercury." Lao Shang saw through the enemy's intentions, and he used his life to remind me to beware of such a reaction test......

So before I went to the Mid-Autumn Festival, I handed over a document that had soaked the residue of my clothes to a ghost. That is, the 'Ouyang' I told you just now, but I believe that Xiao Guodong, the old fox, will not be fooled lightly, and once the arrest operation fails, he will definitely suspect ........"

What kind of great sacrifice is this spirit of benevolence, Shang Qingyuan desperately left a hint to his comrades with his last breath.

Looking at Wu Tongguang's extremely sad expression, Li Wutong was silent for a while, and asked again: "Okay, there is another key question, who is 'Azalea'?" ”