Which is the traditional Chinese character in Preface to Lanting?

The Preface to Lanting is only preceded by the word "jade", which is not traditional. What is the reason? Front? Will you join Lanting in Yin Shan? In this sentence? Yu? It's the same as today's simplified characters, but what about the back? Will you be moved by Sven, too? Is it written in traditional Chinese characters? Yu? . ?