Indeed.
The critical information about Viscount Alexis going to the opera house and sleepwalking in the backyard was given by the steward.
While Viscount Alexis himself also has memories of going to the opera house.
But it could also be 'fabricated' or influenced by dreams, resulting in chaotic memories.
In fact, Viscount Alexis had never been to the opera house at all.
At precisely midnight last night.
The white mist suddenly dispersed in the 'Cass House,' leading everyone into an overlapping space due to someone in the backyard activating the formation.
The steward living in the backyard is under significant suspicion.
"Mr. Black White, overlapping spaces? Does it mean that two different spaces exist at the same place?"
"Yes... this formation, it's both the heart that maintains the overlapping space and the 'switch button'."
Yesterday, someone activated the formation, bringing you into the overlapping space.