At the time of writing the first letter, Hu Sihai was only 26 years old. That was 1988, China had just entered the tenth year of reform and opening up, and the surrounding environment was not peaceful. The festive atmosphere of the Spring Festival has not yet dissipated, and a heavyweight news has once again stirred people's excited nerves. On March 14, in order to safeguard the country's territorial sovereignty and maritime rights and interests, our heroic People's Navy made remarkable achievements in the Johnson South Reef waters! The story of the hero quickly spread throughout the country. In the teaching building of Daxie Middle School in Ningbo City, Zhejiang Province, young teacher Hu Sihai held up a newspaper and read aloud, jumping with joy. As a geography teacher, Hu Sihai has a complete map of China engraved in his heart. Johnson South Reef, the name that only appeared in the textbook, entered his vision again. He found all books and materials related to Johnson South Reef and studied them repeatedly. The isolated reef in the vast sea has harsh conditions, and the outpost where officers and soldiers stand guard is located in the seawater. Seeing the officers and soldiers of Nansha standing in the water, clenched with steel guns, Hu Sihai was moved to tears. From that day on, Hu Sihai made up his mind: in this life, he will do his best to cultivate more young people with faith and responsibility for his country, just like the soldiers in Nansha. Returning to his class, Hu Sihai immediately held a special class meeting with the theme of "The sanctity and inviolability of the motherland's territory". Unlike the previous warm atmosphere, this class meeting has a quieter atmosphere. Newspapers and materials were handed over to 47 students in the class, and the children stared at them with clear and firm eyes. Hu Sihai said to the students, "Our peace and tranquility are only achieved when the reef guarding officers and soldiers guard the coastal areas on difficult islands. What can we do for them?" In the lively discussion, "writing a letter" became the most popular answer. The teachers and students personally designed and made 314 envelopes, and then wrote down their heartfelt words one by one, and put them into the envelopes. But once the letter is written, where should I send it? The teachers and students can't forget that it took them two months just to inquire about the shipping address, and all they got was the approximate communication location of the troops. This is already enough. Hu Sihai sent a letter full of good wishes to the distance, but whether the officers and soldiers of Johnson South Reef could receive it was still in his mind. Since then, waiting has become a common understanding between teachers and students. One month, two months, six months... until that student graduated from junior high school, there was still no response waiting. The children left Daxie Island one after another to study, but only Hu Sihai was still waiting. Three years have passed in a blink of an eye. One day in 1991, a curled letter appeared on the desk of the director of the Education Department at Daxie High School, with two words prominently written at the address - "Navy"! The air has quieted down. Hu Sihai carefully opened the envelope and found that the letter was wrapped in two layers, but a mottled watermark could be faintly seen on the letter paper. Unfolding the letter paper, the black handwriting faded after being eroded by the sea water, but it still looks vigorous and powerful - "The package and letter you sent have been received, and I sincerely thank you for your deep friendship." "Johnson South Reef is far away from the mainland, and the conditions are difficult, but all of this cannot shake our confidence and determination to defend the reef, because the motherland is with us, and you are with us..." Holding this letter that has been waiting for three years, Hu Sihai