The man, known as Yu, bit the defenseless animal to death and then swallowed it whole, and said: “While watching the hamsters die from teasing, I thought I should teach the children it was wrong to make light of life.”
The 44-year-old, wanted to teach his pupils “how dear life is” after finding out that they had taunted hamsters.
Angry parents reported the incident to the police and Yu was cautioned.
He added: “I couldn’t control the situation and couldn’t stand it.
Some parents have are accusing the boarding school in South Korea of trying to cover up the incident.