I'm A Benevolent Doctor, But I Hate All Demons

For twenty-five years, Xu Xian played the role of a kind, weak doctor, beloved by Hangzhou, all while his inner self seethed. He was once the peerless Swordsman who shattered the void with the Zhuxian Sword, a demon-slaying legend who despised all monsters. But a strange, binding karma forced him into this humiliating charade, making him hide his true strength. Now, that karma is resolved. The Zhuxian Sword hums, ready to resume its bloodied hunt. Yet, just as he was about to reclaim his former glory, an ancient white snake demon appeared, seeking to repay a 'favor' from a past life. This demon, whom he loathes, desires to become his wife. How can a swordsman who has slain thousands of monsters fulfill a karma that demands he marry one?