He initially had a fair amount of admiration for Gu Zikai.
Gu Zikai, although he came from the Capital City and later found out that his family background was not ordinary, belonged to that kind of person who could live a life of luxury without effort thanks to his ancestral heritage.
Being born into such a family and still dedicating himself to diligent study, especially leaving the Capital City to pursue education thousands of miles away.
This kind of person has great perseverance, determination, the ability to endure hardship, and persistence! He would surely achieve great things in the future.
Song Chongjin indeed had a good opinion of Gu Zikai, and considering the relationship between their inner and outer courts, he thought that in the future, if they didn't become close friends, at least they would appreciate each other.