The MK Coin (Market Coin) is a cryptocurrency-based payment service improvement project, which improves various problems in the market through improvement of payment system, provides consumers with reasonable consumption and more benefits, and aims at increase sales revenue and costs reduction to companies and sellers. MK Coin is a cryptocurrency currency to ensure user's usability. It can be purchased through exchanges and other designated sales channels, and it is possible to transfer and remit various encryption credits. It is used as a key coin for the MK Coin project and can be redeemed by MK Coin for the agreed payment amount with the partner when paying through MK Pay.