False Memory recap, summary, and ending explained

In his desperate quest to return to the past, Guan Chao scours the world for "Pyrolite" — the energy source capable of powering the Time Gun. But his search takes an unexpected turn when he accidentally falls into the Memory Bureau. To find his way back to reality, Guan Chao must join forces with memory administrators Fangtang, Bai Zhong, and others, clearing BUG beings layer by layer through the strata of memory. Yet as battle after battle draws to a close, what awaits him is far more than corrupted data… The deepest truth buried within memory itself is beginning to stir.