There are travel credit cards that allow earning miles on all purchases and redeeming them with any airline. The Discover it Miles credit card is one of such cards. You will be able to earn 1.5 miles on all your purchases and redeem them with Asiana and other airlines without restrictions. The only requirement to redeem is your ticket should be bought with your Discover it Miles card. The card doesn’t have a traditional sign up bonus but Discover will match all miles you earn by the end of your first year. So basically, you will earn 3 miles your first year and 1.5 miles thereafter.
Disclaimer: This editorial content is not provided or commissioned by the credit card issuer(s). Opinions expressed here are the author's alone, not those of the credit card issuer(s), and have not been reviewed, approved or otherwise endorsed by the credit card issuer(s). Reasonable efforts are made to present accurate information, however all information is presented without warranty. Consult a card's issuing bank for the terms & conditions.
All rates and fees, and other terms and conditions of the products mentioned in this article/post are actual as of the last update date but are subject to change. See the current products' Terms & Conditions on the issuing banks' websites.