Thousands of years ago, Jing Ke died under Ying Zheng's Tianwen Sword. Ying Zheng ordered alchemists to seal Jing Ke's soul into the sword so that he could not be reincarnated.
Thousands of years later, Jing Ke met the reincarnated Ying Zheng again.
The same name, the same face, but completely different moods.