I made grammar, punctuation, and word-usage edits while preserving your tone and narrative style.
"Hmm, how fascinating. It seems like my powers have no effect on you. No, it's not that. Your body is actively filtering my powers out of your system, making it appear as though you are unaffected. How are you doing this? Would you care to share with me?"
Mr. H asked with a fascinated look as he walked closer to Rin.
But Rin instantly went on alert and assumed a defensive stance in case Mr. H did something sudden, like attacking him.
[Don't worry, Rookie. Mr. H is a respected member of the system's workforce. You can call him a 'senior' of yours. Of course, he is not as senior as I am, nor as successful. That's why he's stuck doing grunt work.]
The system sounded proud as it made that announcement. But Rin did not pay much attention beyond the word "senior."
