National Security Act Article 13

Any person of military, public, education and state-run institution authority (agency), who has any of the following circumstances in his service or after his retirement, shall be deprived of his right to the payment of pension; and the pension, if paid, shall be recovered:1. Having committed the offense of sedition or the offense of treason for which the punishment is finally adjudicated.2. Having committed the offense under Articles 7 and 8, or the offense against the allegiance to the nation under the Criminal Code of the Armed Forces, or the offense under Articles 32 to 34 of the Classified National Security Information Protection Act, or the offense under Articles 30 to 31 of the National Intelligence Work Act, for which the punishment of not less than imprisonment is finally adjudicated.The amount to be recovered under the preceding paragraph shall be calculated from the time of committing the offense.