Ye Qingying used to be an orphan.
Many years ago, he was injured by someone and then saved by Yu Linglong.
Yu Linglong indeed owed him a debt of saving his life.
But as for why he was injured in the first place, Ye Qingying had actually forgotten.
His memories were very blurry from before he became an assassin.
In fact, he didn't even know who his master was. One could say that his methods of killing and the Shadowless Sword Technique he practiced were mostly self-created.
Fighting often naturally made his martial arts formidable.
All his moves were honed gradually through real combat.
Despite all this, his past twenty-something years of memories remained quite vague.
Perhaps it was because there was nothing worth remembering, so he was very forgetful, like the seven-second memory of a fish.
There weren't many things in his life he could remember.
Thus, he had also forgotten how he had spent Chinese New Year's Eve for the past twenty-plus years.