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When Chu Liang had initially killed the critically wounded Purple Gold Marquis, who was left with only half a body, it had almost cost him his life. Now, facing a Giant Demon at the Seventh Realm Peak seemed not too difficult, even though the Demon-slaying Sword's blessing played a role, Chu Liang himself felt somewhat sentimental about his own growth.
Although it was a pity to let the White Ghost King escape in order to protect Jiang Guo, upon further thought, if he had allowed the Black Ghost King to self-destruct, although it would have killed both ghosts, there would still have been only one imprint to collect.
By letting the White Ghost King go, if he was killed again in the future, that would be two imprints, and each imprint was a cute Big Head Baby.
Thinking of it this way, he didn't feel dejected.