(BL) Adventure in another world with my sorcery encyclopedia

Yu Su, who perished during the apocalyptic era,
found himself transported back to a primordial era.
Upon arrival, he discovered that he was destitute.
His birth mother had passed away, his father
suffered from mental disabilities, and his younger
brother exhibited signs of autism. The responsibility
of survival now rested solely on Yu Su's shoulders.
Nevertheless, he considered this life far superior to
the apocalyptic era. Armed with determination,
resourcefulness, and a mind teeming with extensive
knowledge of the Sorcery Encyclopedia, he believed
that no obstacle would be insurmountable. In this
primordial era, treasures were abundant, waiting to
be unearthed!
In order to conceal his hidden supernatural abilities,
Yu Su resorted to deception and claimed divine
revelations.
Gradually, he assumed the role of a deceitful deity,
a remarkable imposter who captured the gods'
attention.
Unbeknownst to him, he had unwittingly become
the gods' spokesperson in the mortal realm.