The purpose of this research is to explore ways to raise the quality of the financial services of Suhyup Bank, to secure its customers' loyalty, and to help it achieve sustainable growth. The results of this research showed that the ways to improve the service quality of Suhyup Bank are as follows: establish a relationship between its customers' satisfaction with the usefulness, creativity, reliability, and safety of its services and its customer management based on its customers'

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... mers' decision-making factors; establish service improvement schemes that consider new customer needs and desires; and improve its service quality and raise its internal quality factors, which are the keys to its expansion to customized services.