Spoiler!
MC’s mother is considered the Second Calamity but is actually a g**/master from another world — origin of all life. She lost her memories when summoned, met MC’s father (Gu Clan head), and became his concubine. After regaining memories, she returned through a demonic gate, erasing her time in the Central Plains. MC witnessed this, causing trauma. MC’s father is an anomaly whose power grows passively and is the Calamity’s adversary. He chose to bear godhood himself so MC wouldn’t inherit the curse. He staged her “death” at her request and distanced himself to protect MC from the Gu Clan’s fate.