It could be related to some kind of magic protection. In the wizarding world, there are various protective spells and enchantments. Maybe Harry has acquired or was born with a special protection that makes him immune to allure in this fanfiction.
In the fanfiction, his past experiences with dark magic and manipulation might have made him build a mental shield. He has been deceived and endangered before, and through learning from those situations, he has become immune to the allure that others might fall for.
Look to Chapter 187 for the clearest answer. It begins with During the competition, she passed by him numerous times, unfazed by..., keeps building through There was no visible trace of desperation on her face, yet her presence..., and lands on Perhaps it was a pig that tripped you;
A practical answer is Chapter 201, because it turns the idea into a concrete scene. The chapter opens with The third time she passed by happened to be when she was rushing back..., adds pressure through Miss Jiang, let's take a selfie together., and ends on Indeed, I'm not well-received." "Ahhhh.
The best chapter pointer here is Chapter 217, "No Problem, They're All Red Anyway". It opens with But Director Sun didn't plan to give her any room to think, he directly... and closes on Although her initial performance was mediocre, fortunately, Jiang Li....
Chapter 238 is the strongest chapter-level answer because it starts from Jiang Li was actually first on all three leaderboards?! and follows through on And, to Zhou Xu's alarm, they did find a problem..
The best chapter pointer here is Chapter 186, "The Goddess Who Can't Stand the Smell of Pig Manure". It opens with Seeing Wen Jiaojiao bravely entering the pigsty, Jiang Yan couldn't stay... and closes on And in the instant she fell, the red rope tied to Jiang Yan also broke,....
Chapter 202 is the strongest chapter-level answer because it starts from Jiang Li couldn't believe it, "Just to take a picture?" "Yes, just to take... and follows through on Give me the card." She stretched out her hand expressionlessly..
The best chapter pointer here is Chapter 241, "Thieves Will Shed Two Tears When They Break In". It opens with It wasn't the director," Jiang Yan said with a blank expression, "Did you... and closes on However, as he turned around, before he could see the person properly, a....
If you want the clearest chapter reference, go to Chapter 233. Early on, [What the hell, what's this about life span ending??; later, the chapter leans on Could it be.....] [Ahhhhhh help, bullet screen shield me, it's broad....
Look to Chapter 230 for the clearest answer. It begins with Shang Shaojing's expression wasn't looking too good either., keeps building through He had always been the winner in any field, and there had never been an..., and lands on If he knew that your stepmother was secretly prompting you.