It’s his power’s servant I think? Enemy if humanity most definitely, soon to be an enemy of our boy’s power which will also soon completely merge with our boy. If the story is staying the same, it’s about to get a lot weirder and much larger in scale.
@HirotheHero It's not by choice, groups just keep getting DMCA'd ever since the official English translation came out. I believe Hero Manhua was threatened with legal action too; that's why they dropped it (or they were at least contacted according to their Discord).
Spoiler from the LN (Read at your own risk! If you don't want to be spoiled and enjoy the mystery, DO NOT READ THIS!)
Basically, the Angel is the administrator of the System for Jinwoo and a servant of a dormant cosmic entity called The Shadow King (also translated as Shadow Monarch, but I think Shadow King sounds better). The purpose of the system is to allow Jinwoo to slowly strengthen his body and mind to be able to serve as the vessel of the Shadow King. The Angel's goal is to implant the Shadow King's Black Heart into Jinwoo and have the Shadow King possess him, transforming Jinwoo into the Shadow King's puppet and avatar.
Suffice to say, this will not go quite the way the Angel expects.