The 77th Division was a military formation of the People's Volunteer Army (a.k.a. Chinese People's Volunteers (CPV) or Chinese Communist Forces (CCF)) during the Korean War.
The division was a component of the 26th Army, consisting of the 229th, 230th, and the 231st Regiments.
References
77th Motorized Infantry Brigade (People's Republic of China) Wikipedia(Text) CC BY-SA