Dear Supreme Commander, We've Finally Found You

The protagonist is scrolling through the news when one story catches her attention. A recent headline has gone viral: What exactly happened in 1999? It even brought up the Battle to Defend Earth and a confidentiality agreement. The protagonist casually asks, “Xiao Ai, tell me what happened in 1999.” Xiao Ai replies, “In 1999, the Battle to Defend Earth began. Humanity’s counterattack ultimately secured victory, and the memories of non-combat personnel were erased.” The protagonist asks, “Why did something like that happen?” Xiao Ai replies, “Please enter the operation code.” The operation code? The protagonist sees the diary her father left nearby. She casually types in: ad3169527 Boom, boom, boom! Alarms blare. The whole world goes mad! Xiao Ai’s voice rings out: “Honored Supreme Commander, I’ve finally found you!”