In the moment before William disappeared through the dream tunnel opened by Catherine, at the moment when William spoke his last words, Yi Chen suddenly fell into his past memories.
He remembered how, from the beginning, William's main consciousness had kept him confined between the aquarium, locked in the deepest part, with the aquarium and library further separated by seven entire sealing passages.
Until one day, William suddenly became proactive, he took the initiative to go to the rather dangerous aquarium, and through the glass began chatting with Yi Chen, who was imprisoned in the deepest part, gradually becoming familiar.
After becoming familiar, he gradually lifted Yi Chen's confinement, even actively allowing Yi Chen to walk out from the aquarium,
After multiple internal collaborations between the two, William further used the opportunity of "Silver Turbidity" to specially carve out a 'Second Body' in the back area for Yi Chen.
