You don't have to open them. I handled those two cards last year, and it doesn't matter if they are opened, because the quotas of the two cards are linked together, and the annual fees are also calculated together. As long as you swipe a card six times a year, there is no annual fee, that is, as long as you swipe this UnionPay card more than six times a year, there is no annual fee for both cards, and it is no problem to leave them open. In case of traveling abroad, it is very convenient to swipe a visa credit card.