The Weakest Demon Seeker

She is the most beautiful sword in the Immortal Alliance in the past three hundred years, but she is destined to be unable to cut off the shackles. On the day when Ling Suxin was awarded the title of "Devil-Conquering Envoy", all the people wept and praised the fate of her return. She held the bladeless holy sword tightly in her hand and looked towards the northern demonic realm - the man-eating miasma, the ten thousand bone demonic abyss, and the legendary demon king who devoured everything. "If you go here, you can either slay the devil and become a saint, or..." The elder of the Immortal Alliance swallowed the second half of his words and inserted the lily hairpin into her hair. When she walked step by step to the terrifying demon palace and opened the door, she found that there was no one here. (Although it is a female protagonist, it is not a romance novel. The core is more serious, so I put it on the male side. It is not cheating or mentally retarded, and the main characters all have logic in their actions.)