Interesting, I just tried doing a star alliance booking search through that link out of curiosity. It asked for my Asiana Club user name and password and after I entered them, it came up with the following prompt:

저희 아시아나항공이 운영하는 패밀리사이트 중에 NAME 고객님께서 가입하신 사이트는 아래와 같습니다.

메인 홈페이지 (flyasiana.com) / 아시아나클럽 회원 (flyasianaclub.com) /

For those that do not read Korean, it is suggesting "It seems that you have signed up for the following websites run by us: Main homepage (flyasiana.com) / Asiana Club Member (flyasianaclub.com)."

I was able to select "proceed to Asiana Korea website anyway", but I just find it weird how they try to redirect you to a site that does not even have the function you are looking for.