Why China is Against THAAD?

THAAD is a crucial component of the US effort to deploy a multi-layered, integrated ballistic
missile defense system.
The "high altitude" in the name refers to the capability of the system to intercept incoming missiles at endo- and exo-atmospheric altitudes, with a maximum engagement altitude of around 93 miles (150km) above the surface of the earth.
Nearly all sources agree that The THAAD missile system is developed to defend against hostile incoming threats like short range, medium range and intermediate-range ballistic missiles but not ICBMs.
THAAD’s high-altitude intercept capability reduces the impact of enemy weapons before they hit the ground, and its non-explosive kinetic effect (hit-to-kill) minimizes the possibility of detonation.
The missile can reach a peak speed of about eight times the speed of sound, placing it in the “hypersonic” category.
A Patriot launcher carrying PAC-3 MSE missiles can now be integrated into a THAAD battery.
On January 17 2022 it made its first successful intercept against an incoming Houthi missile over Abu Dhabi.
This is the missile defence shield that scares China.
And the North Koreans hate it!