The massive protests by Korean teachers has less to do with the recent teacher suicides and more to do with wanting to get the child abuse law changed. None of the teacher suicides has been linked to the child abuse law, but the activists are creating the impression the law caused the suicide to get it changed:
On Saturday, around 200,000 teachers from around the country gathered in Seoul’s Yeouido near the National Assembly to commemorate the recent deaths of teachers and to call for the better protection of their rights.
It is very rare for teachers to stage such a large rally on their own without the involvement of labor unions.
The Education Ministry maintains that any teacher taking a leave of absence to join the collective action will be dealt with sternly in accordance with the law and principles.
Education Minister Lee Ju-ho on Sunday asked for teachers to refrain from taking a leave of absence to attend the planned mass rally while pledging to take measures to enhance their rights and authority in the classroom.
Yonhap
You can read more at the link, but what is going on is that a change in the child abuse law caused any teacher accused of abuse to be suspended. This allowed parents that maybe do not like a teacher to claim abuse of their child to get the teacher suspended until cleared of the abuse allegations. Some of these suspension have lasted an entire year. This has caused teachers to not inflict discipline in classrooms because of fears of being accused of child abuse.