JUST as Luo Yan thought, what happened between Dusk's parents wasn't really as this dragon said the first time. But he had to make sure, so he still asked. At least with this, Dusk wouldn't be so sad when trying to remember his ancestry.
He understood why the red dragon lied. It's probably to preserve the honor of their clan. After all, Dusk's mother was probably their clan's equivalent to a princess. It was probably a huge stain to their pride that their lady ended up falling in love with an archdemon. Not only that, she even got pregnant. Of course, these proud dragons would hide that fact.
That fight that Rowan mentioned earlier between the archdemon and their supposed to be rightful king must have happened when the lady was trying to, well, maybe eloped with the former. To get back his daughter, the king fought the archdemon to the death. In which the archdemon died and the king sustained a grave injury.
But was that really the case?