1. The Plaintiff (Counterclaim Defendant)’s appeal against the instant principal lawsuit and counterclaim and the instant counterclaim by the Defendant (Counterclaim Plaintiff).

1. The reasons for the court's explanation concerning this case are as follows: "Seosan Construction" of Part 3, Part 16 of the first instance court's decision as "Seosan Construction Co., Ltd."; "Seosan Construction" of Part 4, Part 8 as "Seosan Construction Co., Ltd."; and additional documents submitted in the first instance trial as evidence of lack or rejection of each argument between the plaintiff and the defendant, and each statement of Nos. 15 through No. 21, No. 28 through No. 31, No. 31 (including serial numbers), and the reasons for the judgment of the first instance except for addition of witnessO and P's testimony as stated in the main sentence of Article 420 of the Civil Procedure Act. Thus, this is cited as is in accordance with the main sentence of Article 420 of the Civil Procedure Act.

2. In conclusion, the plaintiff's main claim is dismissed, and the judgment of the court of first instance which partly accepted the defendant's counterclaim is just. Thus, the plaintiff's appeal against the main claim and counterclaim of this case and incidental appeal against the defendant's counterclaim of this case are all dismissed as it is without merit. It is so decided as per Disposition.