The Omniscient Reader's Viewpoint.
Han Su-Yeong narrowed her eyes after seeing that phrase. "....Isn't that the name of Kim Dok-Ja's skill?"
Why would such a thing be engraved in the gap between the world-lines?
The words continued on.
⸢This was inevitable, I thought. And the reason why I accepted mother's actions also had to be this, as well.⸥
⸢The reason why I inexplicably started writing an essay...⸥
⸢The reason why I had to become a son of a murderer...⸥
These words were moving towards a certain direction at a constant speed. These sentences were fluently stretching from the past towards the future. It was then, Han Su-Yeong came to realise something.
The 'regression' was an act of branching out to a new world-line from a 'certain point onwards' while going backwards in the current world-line.