The biggest misconception people have about her job is that "anyone can do it".
But the truth is, there is more to being a pre-school teacher than singing nursery rhymes.
Pre-school teachers have to change diapers, clean up "accidents" and face the pre-schoolers' brutal honesty, solicited or not.
A pre-school teacher of almost 10 years, who wants to be known as Ms Crystal, says: "Once, a colleague came to help out in my class, where I was the form teacher.
"One of the kids said to her, 'You're not my teacher. You are ugly. I hate you.' My colleague didn't burst into tears but her facial expression changed."
Ms Crystal knew she was interested in teaching when she was in secondary school, and she has always had a soft spot for young children.
She holds a diploma and degree in early childhood education. But all those papers could not prepare her for what she was about to face. In the early days of her career, she fumbled with diapers.
"I fastened the diapers too loosely, so the contents spilt out," she recalls.
Now, Ms Crystal is so deft at changing diapers she can do it while a child is standing up.
But the toughest part of the job is not the soiled diapers, but dealing with the growing demands of parents.