Lin Xingjie was well aware that the other party was just trying to enrage her, hoping she would kill him as soon as possible.
Meng Zheng, facing imminent death, became aware of the truth about Lin Mingyuan's brainwashing and felt the profound regret of being manipulated like a puppet for an entire lifetime;
although he lived on, it was actually due to the power planted by the President of the Stargazing Society. He was merely a platform for "waste recycling," soon to be replaced by the Evil Spirit, without any room for resistance. This sense of powerlessness was probably more galling to him than death itself.
From beginning to end, from birth to death, his life was always being exploited by others; all his ambitions seemed like a joke.
Appearing over and over, failing over and over, his existence was not only irritating but likely plunged himself into a Sisyphean despair as well.
By contrast...