The Eighteen Levels of Hell: Lying is Forbidden Here

'Personality?'

'So that was it. Old Man and the fat otaku beat them at their own game. Based on the layout of the two police officers, they deduced that the female officer's identity was a Deceiver's Tongue.'

'Thereby making everyone overlook the true Deceiver's Tongue in the entire Small Hotel.'

'Old Man is the owner.'

'This is the true Deceiver's Tongue. Once someone states who among the eight is a primary or secondary personality of so-and-so, it is equivalent to denying the identities of all eight people. This naturally includes Old Man, which is tantamount to denying Old Man's Deceiver's Tongue!'

'Denying a Deceiver's Tongue requires denying a unique link in the chain.'

'However, the fact that the eight people are the personalities of Chen Ran and Lin Jiabei is something we reasoned out. It lacks uniqueness because, from an objective standpoint, there is no substantive evidence.'

'Therefore, whoever speaks with certainty about who is a primary or secondary personality is lying.'

From an omniscient perspective.