
Just went back to re-read to brush up and what did euntae mean he is a "ability user that was created" ?? Like they just skimmed over that and went into flashbacks!! So did mc create him?? But he brainwashed his mom to love him more than euntae so like he had to exist before no??

Maybe when he was a kid, he hit him with the:
"I wish you suffered/struggled just like me"
"I wish you were like/the same as me"
"I wish you were an esper like me" (so I'm not alone kind of thing).
Honestly, with his power, there's a lot a kid could have said out of anger/frustration/desperation that would have resulted in Euntae being created.
However, I'm with you. It feels like a big plot device to just throw it out there and not elaborate.

Who the magician man again?? Also why was he so upset that she changed their work? Like I forgot why they beefing

I think it's about the relocation of the human resources or magicians in the magic department to places that lack and might need magicians. Think of it like the whole department being reshuffled and sent to different locations, going from the capital city to distant villlages with not much to offer. As they had no say in where they go, this sudden relocation made the magicians angry, on the other hand our FL no.3 is doing all this because most of the magicians are not doing anything proper work wise despite their budget. Just my interpretation of the situation presented to us.
Seriously he didn't have the balls to stop his mother from the get-go and stutter to say "oh I'm supporting lingwei " THEN DO IT! You're just sitting there letting your dumb mother spew nonsense! If you truly love lingwei you would have shut your mother up!!! I don't approve this marriage either lol *makes Mr. He face*