I don't know why everyone keeps talking about the 5th measure
The 9 measures in Article 17, paragraph 1 are:
Article 17 (Countermeasures against Aggressor Students)
(1) An autonomous committee shall request the head of a school to take any of the following measures (or several concurrent measures) against an aggressor student in order to protect a victim student or to enlighten and educate an aggressor student, and standards applicable to each measure shall be prescribed by Presidential Decree: Provided, That the expulsion from school shall not be applicable to an aggressor student enrolled in a compulsory educational course: <Amended by Act No. 9642, May 8, 2009; Act No. 11223, Jan. 26, 2012; Act No. 11388, Mar. 21, 2012>
1. An order to give a written apology to a victim student;
2. Prohibition against making contact with, threatening, or retaliation against a victim student and a student who has reported, or notified, school violence;
3. Service to a school;
4. Service to the society;
5. Completing a special educational course or receiving psychological treatment from an internal or external expert;
6. Suspension of attendance;
7. Change of class;
8. Transfer to another school;
9. Expulsion from a school.