A student at my school recently committed suicide. I was told the morning after it happened. Originally I was just told that he died, but as the day went on, I found out it was a suicide. That evening, I went with some teachers, the principal, and students to a memorial service at the hospital. Seeing the look in the father's eyes was definitely one of the low points of my time here in Korea.
I was told not to discuss the issue with the students, or to just say "I don't know" if I was asked questions. No students ever approached me about it. He was a special needs student, so I don't think many of the students knew him personally.