You can register a Hancom Space coupon you have as below.
How to register the coupon
1. Click the link [Have a coupon?] at the center of the homepage.
2. After login, please go to Settings from the side bar. Click "Subscription" tab at the top of the page, then you can find out Coupon section at the bottom of the page.
You can check the registered coupon list and period (GMT 0:00) on the page. You can get more storage or PRO service period extended according to the coupon benefits.