Kuang Chuan asparagus juice 光泉蘆筍汁

The taste of this asparagus juice was rather disappointing because it just tasted like cane sugar juice.
On the packaging, it states that a low percentage of the drink is made up of asparagus juice so what is the made of??

More information on this drink:
光泉正庄蘆筍汁:

http://www.kuangchuan.com/03Product/Product01a.aspx?id=17802

Chou Chin brand:

http://supersupergirl-food.blogspot.hk/2012/08/chou-chin-bomy-asparagus-juice.html