Misappropriation of cash without consent constitutes a serious breach of duties regardless of repayment or others' actions.

The Supreme Court dismissed the cassation appeal in a dispute over the reinstatement of an employee who repeatedly withdrew cash from the store register without employer consent. Although the employee repaid the funds and other staff had similar practices, the court found these factors irrelevant to the severity of the breach. The decision rested on the conclusion that such unauthorized withdrawals constitute a serious violation of employment duties under Article 52 of the Labor Code.