Child support is a legal obligation of a non-custodial parent. It usually matters when the couple is divorced. But a separated spouse can ask for child support, too.
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When the parties cannot agree on the amount of child support, the court makes the decision. In this regard, the Korean court has an internal rule to calculate the child support amount in Korea. Although this internal rule is not mandatory, many judges refer to this before making a decision. So it is worth looking into. It can give you a general idea of how the Korean court determines the child support amount.