Park Jae-hyun (박재현), head of Nun21 who led the development of Samsung Pay, and Park Ji-su (박지수), head of Suho.io and an early developer at Upbit, have co-authored a book titled "Core Stablecoin — A Map of Wealth Changed by PayFi and AI," published by Hanbit Media.

The book redefines stablecoins not as a cryptocurrency investment tool but as a core layer that integrates money, payments, settlement and credit. It analyses how a KRW stablecoin would reshape banks, payments and an AI agent economy from technical, legal and financial perspectives.

The authors develop the book around four questions: why governments and central banks in various countries are wary of stablecoins; whether banks will disappear or evolve; and what structural changes a KRW stablecoin would bring to South Korean finance.

The authors' key message can be summarised into five points.

They say stablecoins are not "coins" but a core layer integrating money, payments, settlement and credit. They say banks will not disappear but will evolve into infrastructure that exists through code and trust rather than buildings. They say a KRW stablecoin is both a crisis for domestic exchanges and a rare opportunity to leap into global financial infrastructure. They say an AI agent economy will see the emergence of algorithmic corporations with wallets, capital and responsibility. They say regulation is not a matter of prohibition but of design.

Park said, "Stablecoins are not an extension of cryptocurrency but a redesign of financial infrastructure." Park said, "A KRW stablecoin is a rare opportunity for South Korea to secure digital currency sovereignty."