1. Review of the reasoning of the lower judgment and the record reveals the following facts.

A. On January 2, 2016, the Defendant applied for authorization to establish a regional housing association to implement a new apartment construction project at Pyeongtaek-si (location omitted), and is a regional housing association that obtained authorization to establish an association from the head of Pyeongtaek-si on April 6, 2016.

B. On May 16, 2015, prior to the authorization to establish an association, the Plaintiff entered into an agreement with the Defendant to become a member of the Defendant and to be supplied with the apartment (water omitted) (hereinafter “the instant first agreement”).

C. Pursuant to the instant first contract, the Plaintiff paid KRW 20 million in total as the down payment among the union members’ contributions from May 16, 2015 to July 23, 2015, and KRW 11 million in total as the administrative service cost on June 22, 2015 and the following day.

D. On the other hand, on January 27, 2016, the Plaintiff was notified by the Defendant that the Plaintiff owned a house exceeding 85 square meters for exclusive use, and thus constitutes a ground for non-member qualification. The Plaintiff asked the Defendant about the foregoing issue, and provided explanation from the Defendant that, if the Plaintiff sold the house owned by the Plaintiff and prepares a partnership subscription contract as a day after the date of sale, there is no problem in obtaining membership qualification.

E. On April 25, 2016, the Plaintiff received a notice from the Defendant to additionally pay KRW 46 million out of the cooperative contributions under the instant first contract, and paid it on the following day. On May 24, 2016, the Plaintiff sold the Plaintiff’s house and completed the registration of ownership transfer under the purchaser’s name, and notified the Defendant of such fact.

F. On June 20, 2016, the Defendant requested the Plaintiff to re-consign a partnership membership agreement as the Plaintiff’s ground for disqualification was eliminated, and on June 21, 2016, the Plaintiff entered into a partnership membership agreement with the Defendant with the same content as the instant first agreement (hereinafter “instant second agreement”).

G. On January 2, 2016, the Defendant notified the Plaintiff after the instant secondary contract, and the Plaintiff failed to meet the requirements for homeless as of January 2, 2016, the date of application for authorization to establish a housing association, and received authorization to change the regional housing association from the head of Pyeongtaek-si by excluding the Plaintiff from its members on February 23, 2017.

2. In principle, the issue of whether to accept an application for resumption of oral proceedings when the parties filed an application for resumption of oral proceedings to submit arguments and evidence after the closing of oral arguments is subject to the court’s discretion. However, as the parties who filed the application for resumption of oral proceedings have not been adequately given the opportunity to submit arguments and evidence due to the reasons for which it is difficult to assume their responsibilities before the closing of oral arguments, and the decision against the parties without granting the opportunity to submit arguments and evidence is contrary to the procedural justice pursued by the Civil Procedure Act, the court has the duty to resume oral proceedings and continue hearing in case where the parties concerned have failed to comply with the procedural justice pursued by the Civil Procedure Act. In addition, in case where the court concluded oral proceedings while violating the duty to explain and point of view regarding the factual or legal matters, and the parties concerned filed the application for resumption of oral proceedings to submit arguments and evidence, and where there were any errors in the litigation procedures that may affect an appropriate and fair resolution of the case, the court responsible for the examination and determination of the case has the duty to continue the oral proceedings in order to remedy and resume such unlawful acts (see, etc.).

3. The Plaintiff, as the cause of the instant claim, rescinded the agreement, and filed a claim for the return of the Plaintiff’s share of cooperative members and administrative service costs borne by the Plaintiff to the Defendant on the premise that the instant secondary contract is null and void. The lower court rejected the Plaintiff’s claim on the ground that the instant secondary contract is null and void in terms of the original impossibility of payment, but the agreement cancellation of the instant primary contract is null and void without going through the Defendant’s general meeting resolution.

4. However, according to the records, the defendant asserted that even if the first contract of this case was automatically rescinded through each of the preparatory documents dated November 16, 2018, June 3, 2019, and October 15, 2019, the plaintiff only has the right to claim a reimbursement within the scope that deducts penalty, etc., even if the first contract of this case was automatically rescinded. The above preparatory documents are all stated on each of the dates for pleading, the plaintiff completely denied them without using the defendant's conjunctive assertion, and the plaintiff completely denied them without using the defendant's conjunctive assertion. The defendant asserted that the penalty for breach of contract claimed by the defendant is excessive through the application for resumption of pleading as of August 4, 2020 and the preparatory documents as of September 11, 2020, which are after the closing of argument in the court below.

5. In addition to these proceedings, if the Plaintiff submitted a written statement to the effect that the Plaintiff was already excluded from the Defendant’s union members at the time of the closing of argument in the lower court, and that the penalty claimed by the Defendant is excessive after the closing of argument in the lower court, this can be seen as a cause of the instant claim after the resumption of oral argument, which is the cause of the instant claim, to add the return of the remainder within the reasonable scope after deducting penalty, etc. from the penalty, etc. within the reasonable scope, under the premise that the first contract in the instant case was automatically rescinded. In light of the above, the lower court need to sufficiently examine whether to maintain the validity of the first contract

Nevertheless, the lower court rejected the Plaintiff’s claim on the grounds stated in its reasoning without reaching it. In so determining, the lower court erred by neglecting the exercise of the right to ask for seat and failing to exhaust all necessary deliberations, thereby adversely affecting the conclusion of the judgment.

6. Therefore, the lower judgment is reversed, and the case is remanded to the lower court for further proceedings consistent with this Opinion. It is so decided as per Disposition by the assent of all participating Justices on the bench.

Justices Kim Jae-hyung (Presiding Justice)