Responses
From the flashbacks or nightmares he has ido abused him treated him bad seijin offed himself with the gun (the flashback he got when he went to the bathroom is probably ido crying after he did it) and someone that gave a novel spoiler said he did it while pregnant typical omegaverse story abuse them then regrets it
Imo some of seijin dialogue seems like he is depressed
PLEASE GIVE ME SPOILERS I AM TIRED OF BEING CLUELESS WHAT HAPPENS IN THE PREVIOUS LIFETIME