The reason why Yamamoto Muramasa would rather not seize the Taiji Seal but kill Ye Xunhuan is because of his fiancée, Chiaki!
Once, Yamamoto Muramasa was Chiaki's fiancé, the distinguished son-in-law of the Koga school among the three major Ninja systems of Fusang!
But after Ye Xunhuan appeared, everything changed.
His fiancée Chiaki betrayed him, betrayed their marriage, betrayed their love, and on their wedding night, she gave herself to Ye Xunhuan, even making him guard the door!
For a man, this is an absolute disgrace, yet he had no means to retaliate.
Whether it was the Ye Xunhuan or the Koga school at the time, he couldn't contend with them and had to rely on their mercy to survive.
This is why at first, Yamamoto Muramasa never revealed why he wanted to kill Ye Xunhuan.
After all, being cuckolded is something that is unbearable for anyone in any country and would be something people gossip about.
