Good looks, two suits, three glasses of wine, four rounds of mahjong, five friends, six trips to Qishan ... until 10.

This is the second lecture of Professor Ceng Shiqiang on interpersonal relationship.

But this is actually a folk proverb, and it is hard to say who said it first. It's just that Professor Ceng Shiqiang is the most famous person I know recently to explain interpersonal relationships.