loyal; devoted; faithful

see 吳忠市|吴忠市[Wu2 zhong1 Shi4]

to display utter loyalty; to be loyal to the end

die-hard (fan etc)

Huang Zhong (-220), general of Shu in Romance of the Three Kingdoms, portrayed as an old fighter

Zhang Xianzhong (1606-1647), leader of a late-Ming peasant revolt

Zhang Zizhong (1891-1940), Chinese National Revolutionary Army general during the Second Sino-Japanese War

Tsai Chih Chung (1948-), famous Taiwanese cartoonist specializing in retelling the Chinese classics

the most treacherous person appears the most guileless (idiom)