Who wrote the last letter from the Invisible Guardian?

The last letter of Invisible Guardian was written by Zhuang Xiaoman. In the final finale, Zhuang Xiaoman did not stay with Xiao Tu, but went to America with a Chinese American who saved her and got married. At the end of the story, Zhuang Xiaoman sent a letter to Xiao Tu, saying that the agreement is still there. Please look forward to this intriguing sentence.

Introduction to the game background of Invisible Guardian

The original work is a visual novel created by fantasia. The game tells the story of a patriotic young man who returned from studying in Japan. During the War of Resistance against Japanese Aggression period, he lurked behind enemy lines, struggled with various forces, and finally made great contributions to the revolutionary cause of China. Your name is Xiao Tu. Two years ago, you were in Shanghai. An impassioned patriotic student ran around the street, shouting anti-Japanese and saving the country, but was arrested and imprisoned because of his youthful spirit.

After you were released, your teacher arranged for you to study in Japan. Two years have passed, and your patriotic student image has long been forgotten. Teachers and organizations have decided to let you infiltrate the enemy. How to play the spy tactfully? Faced with a difficult choice, whether to take care of the overall situation or be soft-hearted.

Return to the turbulent war years, become an invisible guardian, and experience the spy war life step by step. Every choice you make will affect the outcome. There are hundreds of branching plots waiting for you to unlock, and you are deeply moved by three completely different endings.