After waking up, a little transparent female college student named "Gu Meng" decided to start an adventure and embark on her own journey.
A string of mysterious numbers, a courier from a stranger, a yellowed library card, a strange locked box...
"3221..."
"I came specifically for you..."
"Don't trust anyone..."
"I'm sorry..."
"..."
Behind the layers of fog, can the long-shrouded truth be revealed...
Mission: The truth cannot be concealed, and justice will eventually defeat evil.