Penny became Professor Singh's apprentice in her first life. Therefore, she knew some sides of this professor, just like how Professor Singh knew some sides of her. He was akin to a father to her, after all, nurturing her and guiding her. Sometimes, he would give her some tough love.
In other words, Professor Singh often finds out things even before Penny confesses or even before she does it. It was the reason she intuitively panicked when Professor Singh gave her that look.
But then, Professor Singh smiled and asked gently. "Miss Penny, how are you?"
Hearing his smile and the change in his tone, Penny mentally patted her chest. She heaved a sigh of relief.
'Goodness. Right. In this lifetime, I'm still not his apprentice, so no tough love and scolding. There's nothing to be scared of.'
"I'm okay, Professor. I've started school." Penny quickly recovered from her mini heart attack and smiled charmingly.