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Lin Fu was ultimately convinced by the incessant persuasion of the Heart Demon, and he planned to ask Yu Ziqing about it.
Looking for the Crown Prince of Dali was out of the question; his situation could not be revealed to outsiders, regardless of how unique it was, because, strictly speaking, it could potentially be replicated.
Collaborating with a Devil was like retrieving a hot chestnut from the fire; mishandling could easily lead to disaster.
He temporarily believed in his Heart Demon, not because he was bewitched, but because of continuous probing, plus the Heart Demon seemed eager to open its heart to him. In addition, they took the Heavenly Devil Great Oath together. With all these factors combined, he dared to go forward with it.
There was another crucial reason: Normally, he could not possibly advance to the Eighth Tier.