Because it is a credit card with a single logo of UnionPay, it can be traded through the UnionPay network (swipe your card at a merchant with a logo of UnionPay, and the landlord can rest assured that UnionPay is already very common in Japan), and the yen traded will be converted into RMB without any currency conversion fee. When you come back, you can pay RMB directly according to the bill. And the activities of UnionPay will become more and more affordable.