I find it so ironic: like if I was asked, I would say that Doom Kiyoung IS the most true version of Lee Kiyoung.

"sword of the light" it kinda sounds like 'light stick' ¬u¬

Let me guess: it's how Altarus(?) always talked to Kim Hyusung, and he basically caused his psychological PTSD

HE SAID IT!!!!

Even though it's not the whole written story (like in internet there're all chapters - story is completed) and firsts chapters might look weird, just give it a shot. I really liked characters and well-build world. It's also fluffy story after you get throught some misunderstandings. And when you do, you will se a wholesome relationship between MC and ML. I totally recommend <333