This tragedy has unleashed a wave of anger from primary school teachers across South Korea, who have started to share their experiences of being bullied by overbearing parents and unruly children.

They say parents frequently push them to breaking point, by calling their personal phones every hour of the day and weekends, incessantly and unfairly complaining.

For the past six weeks, tens of thousands of teachers have rallied in Seoul, claiming they are now so scared of being called child abusers, they are unable to discipline their students and intervene as they attack each other.

Traditionally, Korea had a very strong culture of respecting teachers, he explained, but because of the country's rapid economic growth, many parents are now highly educated.

Another teacher, Kwon, told us that in the 10 years he had been teaching he had taken two periods of sick leave to cope with depression and panic attacks, triggered by the stress caused by parents and pupils.

Shin Min-hyang, who runs the organisation Solidarity for the Protection of Human Rights of Students and Parents, admitted much of the behaviour highlighted over the past month was unacceptable, but argued that these cases were outliers.

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