Who is the calligrapher who started to change the font membership system into regular script?

The earliest regular script writer was Zhong You in the late Eastern Han Dynasty. In his handed down works, the brushwork of official script is still reserved. Regular script experienced many changes in Wei, Jin, Southern and Northern Dynasties, and was basically finalized after Sui and Tang Dynasties. After the script is finalized, it is quite exquisite and rigorous in strokes and structure, such as the works of Ou Yangxun, a famous calligrapher in the Tang Dynasty.