1. The defendant's appeal is dismissed.

2. Of the costs of appeal, the part resulting from the intervention is the Intervenor joining the Defendant.

1. The reasons for the court's explanation concerning this case are as follows: (a) under the first instance court's judgment No. 2, 2: (b) from 2-4 "Plaintiff B Trade Union" to 2-4 "Trade Union" was established as the organization of workers belonging to the B Group and its affiliates, etc. (hereinafter "B Trade Union") on July 13, 201. B unions opened a general meeting on December 28, 2012 and decided to continue its activities as the B Branch of the Plaintiff National Metal Trade Union by opening a new organization of B Branch of the Plaintiff National Metal Trade Union; (c) on January 14, 2013, the members of the Plaintiff National Metal Trade Union joined the Plaintiff National Metal Trade Union; and (d) the members of the Plaintiff's union were all members of the Plaintiff's union as stated in the first instance court's judgment "B union" to "B union"; and (d) the reasoning for the amendment of Article 20 of the Civil Procedure Act to the first instance judgment and the second instance judgment as stated below's reasoning.

2. Details to be added; and

A. As to the existence of grounds for disciplinary action Nos. 3 and 4 of the Intervenor’s argument, the Defendant and the Intervenor’s act of collecting and editing personal information files of this case and files of purchase and sale data of this case (hereinafter collectively referred to as “each file of this case”) using the Intervenor’s computer network and then transmitting them by e-mail is intended to remove the Intervenor’s major trade secrets under Article 131(6) of the Rules of Employment without permission, in light of the Intervenor’s concept of trade secrets, the independent economic value carried out each file of this case, and the form of the Intervenor’s management.