2 questions

Not always. Severance is generally required when an employer terminates under Article 11, the proviso to Article 13, Article 20, or another qualifying provision, and when a worker terminates on a statutory ground under Article 14. It is generally not required for a disciplinary termination under Article 12, and an ordinary voluntary resignation does not automatically trigger severance. The legal ground, notice, payment deadline, and service under the new and old systems must be reviewed separately.