The Chai Jin era is too expensive to say. Clearly, play a zodiac every October.

Chai Jin is very expensive, and October Sky is very sunny. From the description in the title, we can guess that the answer to the title should be one of the zodiac signs. It can be inferred from the description that the answer is "dog".

This is because "Chai Jin's era is beyond words" refers to "Dog Day". In the lunar calendar, each solar term has a specific zodiac sign, while the solar term in October is cold dew, and the corresponding zodiac sign is dog. And "the sky is high and the clouds are light" is to match the previous sentence "The Chai Jin era was too expensive to say anything", expressing that the bad weather has passed and the weather has become clear and refreshing. So according to the above analysis, the answer should be "dog".