Article 4(1) (Employment of Fixed-Term Workers) Act on the Protection, etc. of Fixed-term and Part-time Workers, as last amended by Act No. 12469, Sep. 19, 2014
This falls the case where the exception of 2 years of limitation.
When a fixed-term worker is needed to fill a vacancy arising from a worker's temporary suspension from duty or dispatch until the worker returns to work, an interim employee can replace the temporary absence of another employee.
*Act on the Protection, etc. of Fixed-term and Part-time workers
Article 4 (Employment of Fixed-Term Workers)(1) Any employer may hire a fixed-term worker for a period not exceeding two years (where his/her fixed-term employment contract is repetitively renewed, the total period of his/her continuous employment shall not exceed two years): Provided, That where a fixed-term worker falls under any of the following subparagraphs, any employer may hire such worker for more than two years:
1. Where the period required to complete a project or particular task is specified;
2. Where a fixed-term worker is needed to fill a vacancy arising from a worker's temporary suspension from duty or dispatch until the worker returns to work;
3. Where the period required for a worker to complete his/her schoolwork or vocational training is specified;
4. Where an employer enters into an employment contract with a senior citizen as defined in subparagraph 1 of Article 2 of the Employment Promotion for the Aged Act;
5. Where the job requires professional knowledge and skills or is offered as part of the Government's welfare or unemployment measures, as prescribed by Presidential Decree;
6. Where any reasonable ground exists equivalent to those mentioned in subparagraphs 1 through 5, as prescribed by Presidential Decree.
(2) Where any employer hires a fixed-term worker for more than two years although those grounds under the proviso to paragraph (1) do not exist or cease to exist, such fixed-term worker shall be deemed a worker subject to non-fixed term employment contract.