"There is no illness here, Lan Wangji." Wei Wuxian retorts, just this side of flippant, even as his grip on Chenqing tightens. "No poison, no tragic degradation. I am the same as I have been for years. I have control."

It even has the benefit of being true. There's no golden core to corrupt, and his body was ruined long before he stalked Wen Chao to his death. What damage there is was dealt out long before they could even argue about it.