Transmigrated as the Cold, Aloof Master Who Was Killed to Prove the Dao

Blurb:

Yin Quan transmigrates into a book, landing inside his long-abandoned masterpiece, The Peerless Sword. In pursuit of the Way of the Peerless Sword, the protagonist Ling Jue commits every manner of evil. He kills his adoptive father, betrays his master and ancestors, and kills his wife to prove his Dao... Ling Jue's gaze is chilling, his crimes too numerous to record, yet he feels neither regret nor resentment.

The longsword in his hand gleams with icy light. He has no heart, no feelings, no desires, no needs, no sorrow, and no joy. This is what they call the Peerless Sword!

The Peerless Sword is the work Yin Quan is most proud of. (Even if he abandoned it before the ending.)

...It would be even better if the adoptive father, master, and husband being cut down weren't him.

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At the summit of a snowy peak.

Yin Quan gazes solemnly at Ling Jue, who points his sword at him. A smile of long-awaited fulfillment appears on his face. "Come on, kill me, and prove this peerless swordsmanship!"

But Ling Jue doesn't do as Yin Quan expects and cut his throat with a single stroke. Instead, he lets go of the sword, allowing the unparalleled blade to fall into the snow.

"Master, do you know? I've hated you my whole life. First, I hated you for being my father and saving my life. Second, I hated you for being my master and teaching me the sword. Third, I hated you for being my husband and swearing eternal vows with me, only to fill them with lies." His lips curl in mockery. "So... I won't give you what you want. What the hell is this Peerless Sword? The only Dao I seek is you!"

Top, older man x younger man. Both are crazy, and both are completely unhinged (.)

Theme: Only love can make a person whole.