1. The defendant's appeal is dismissed.

2. The costs of appeal shall be borne by the Defendant.

3. The judgment of the court of first instance No. 1 and No. 2

1. Basic facts

A. On September 1, 2014, G Co., Ltd., Ltd., the Defendant’s telegraphic body, divided the company into H Co., Ltd., and transferred all rights and duties relating to the credit card sector to H Co., Ltd., Ltd., and thereafter H Co., Ltd., upon absorbing I Co., Ltd. on December 1, 2014, changed its trade name to “B Co., Ltd., Ltd.,” the Defendant as of December 1, 201 without distinguishing between “Co., Ltd. G” and “B”. On April 26, 2011, the Plaintiff recruited the subscribers by withdrawing D Card from April 26, 201. The above credit card was issued 200,000,000 won per 1,50 won (in addition to the credit purchase function, 200,000 won, 200,000 won and 10,000 won, and 201,01,000 won,0.

B. On February 26, 2013, the Defendant changed the value-added service: (a) reduced the rate of accumulation of mileage provided to the instant card holders from September 1, 2013 to KRW 1.500 per 1,500; and (b) notified that the conditions and frequency of provision of additional services are reduced.

C. The instant card.