To Catch The Biggest Rat

She studies hard and aims to be a good nurse someday, while he is a famous doctor. She trespassed other people's laboratories to learn, while he has his own laboratory.
What will happen if one night she found herself trespassing his laboratory? What do you think she will do? No, the question is, what do you think he will do?
She's like a rat that lurks in his house uninvited, and he won't let it. No, he'll catch it, he'll catch the biggest rat.