What are the characteristics of calligraphy in Wei, Jin, Southern and Northern Dynasties?

Calligraphy in Wei, Jin, Southern and Northern Dynasties is still full of charm, especially in Wei, Jin and Southern and Northern Dynasties. During this period, calligraphy, lines and cursive script developed from the reform of Han Liguan developed rapidly, and a large number of famous calligraphers emerged, such as Zhong You, Erwang and Zhang Menglong. Regular script even appeared the world's first running script "Preface to Lanting", which can be said to be a strong development period in the history of calligraphy in China!