Doesn't renew – EBS 한글이 야호: 가나다 따라쓰기 Review

I bought this app on the iPad and my other iPad doesn't renew. I do have same account for the both of iPads. Please figure it out for me. I don't want to waste my money
Review by Jiniju on EBS 한글이 야호: 가나다 따라쓰기.