While more and more financial technology like blockchain, rob-advisor, and chatterbot shows up and the intention of the government to improve financial inclusion, internet-only bank rise in Taiwan and trigger a catfish effect in the financial industry. However, there seems a lot of challenges like over-supply of financial service or online banking business restriction for an internet-only bank, how come an internet-only bank with branchless restriction to win over those traditional banks and make profits in these hyper-competitive market? This study uses the case study approach to research several famous internet-only bank cases in China, Japan, Singapore and Hong Kong and South Korea and integrate their operating strategies. Secondly, we use PEST analysis to define the external factors of the financial environment. At last, we use SWOT analysis to recognize the strengths and weaknesses of Next Bank and combine the external factors into opportunities and threats and comes up with some recommendations and suggestions about operating an internet-only bank for Next Bank or others who want to join this field to take a reference.