@darara
It's been referenced for a long time now, with no real specifics. We can infer from the material that I've translated (up to volume 5) that Sunghoon and Narae had a huge argument when they were kids. Narae says in volume 1 that she hates being called selfish or something like that, so Sunghoon probably accused her of that.
Oooh, there's going to be some massive emotional timber felling come the next chapter. Sunghoon is going to be feeling the wrath of 5000yr old ghost in the space of minutes. Is NOT going to be pretty. Also, Narae kind hearted? Hmmm. S-level tsundere perhaps.
@Dijon thank you for your work scanlating this, I am *very* much enjoying it!
Me in MC's place: So here is a question for you saehee. ¿How long do you think it will take you to find another perfect doll to be Rangii's spouse? grabs knife and cuts neck....good....lu..ck...w....with...it....ha...haha...hahaaaaa...dies