7月21日电，港股IP经济概念股午后持续下挫，巨星传奇跌超20%，阅文集团跌超5%。

Group 1 - The core viewpoint of the article indicates a significant decline in Hong Kong's IP economy concept stocks, with notable drops in specific companies [1] Group 2 - Superstar Legend experienced a drop of over 20% in its stock price [1] - Reading Literature Group saw a decline of more than 5% [1]