This book is a military-themed novel that tells the story of the protagonist Xu Kailu and his post members who silently guard the Kunlun Mountain Tunnel, the lifeline of the northwest, all year round at a commanding height in the Kunlun Mountains where natural conditions are extremely harsh. He collaborated with his comrades to arrest poachers, resolve explosion dangers, and led new team members to investigate and intercept the infiltration of foreign sabotage forces. However, he was ashamed of his wife and son whom he had never met. He is loyal to his beliefs and dares to fight, showing his daring loyalty to defend the motherland's territory to the death and his fighting spirit of not being afraid of hardship and death. This is a beautiful triumphal song and heroic epic that reflects the courage and soul of the border guards. Like Xu Kailu, each plateau soldier has his own path of growth and emotional world. It is their duty to defend the country, but as individuals, they have to face more challenges and struggles, as well as silence, loneliness and even sacrifice. This book truly reproduces the noble sentiments of those ordinary but great soldiers who grew up in battle and persevered in silence. It expresses the determination of border soldiers to defend the country with responsibility, responsibility and duty, and makes the strongest voice of loyalty to the motherland and adhering to border defense. It is a work of positive energy.