When the boyfriend you have been with day and night starts to feel strange to you, his secret is gradually revealed with a mysterious iron box. Faced with photos from the Republic of China period and your boyfriend's weird and absurd letters, how can you step by step uncover the secrets hidden by this man from seventy years ago...
Just like interstellar travel, love can transcend time and space
Concept: Just like interstellar travel, love can transcend time and space