How to evaluate the friendship between Xiao S and Cai Kangyong?

Because the small S has always maintained a rare vitality, the original vulgar steaming vitality. No matter how boring life is, she can be in high spirits. The attraction of this kind of happiness should be the most touching to Cai Kangyong. Scholars are easily sensitive, but the emotional world of a comrade is more lonely. Small S is lively and childlike, which is an important link between Cai Kangyong and the human world. Just like Jiang Dongxiu around Hu Shi and Liao Cuifeng around Lin Yutang.