
Spoiler
A bit of history:
When Ml was age 14, he was raped by his wife. He had to do it for the sake of his "duty" to produce a kid/heir. So this traumatized him from loving a women and that's why he neglected his daughter and queen. After he married queen, she tried to kill black and jump ml. [Korean novel] I can't read Korean but I thought I should share what I found :3
Romance:
In the novel, out of 180 chapters [I think], the ml and fl will start to realize their feelings for each other. Like 3/4 of the novel. More than halfway through. They had to learn to love themselves first before loving each other. So it took time for their relationship to improve. It's a longgggg development but It's so wholesome.
I'm literally loving the character developments, reactions, and plot.

This manhwa is so good ╥﹏╥
But the possibility of the death of the ml's parents are probably not done by fl's dad.
There's a 50% chance that the father [fl's father] got there late after a big assassination or fight. Resulting in ml's parents dying. After Demon King arrived at the scene, killing all the left over enemies, ml comes out and sees Demon King drenched in blood. This results him thinking that the one who killed his parents was the fl's father.
NOTE: it also mentions that due to Ah woo's skills, fl's dad killed his parents [early chapters]. So with that in mind, the fight in this prediction probably started because they also wanted his[ml] skills for their own benefit.
If he and the ml's dad got along, it's not reasonable for them to kill each other. I mean it's not impossible. But if they had a good relationship, they'll be willing to help one another.
With that in mind, the fl's dad is the demon king. So it's reasonable for ml's parents to refuse his offer of using ml skills for next sect lead.
But this is just a possibility in my opinion and what I think.
(づ ̄ ³ ̄)づ but im loving it so far
Thankyou so much!! I had a tough day today and this shit was spiccyyyyyyy!!! I love them so much and hope for a volume 2. HOPEFULLY THERES CHILDREN. I would die happily.