铁石心肝

Explanation: See the "heart of stone." 　　Source: Ming Liu against the "golden couple Jiao Hong Ji" I gave birth to a stone Qianpo darling, Zhou Zhao Ling handle frozen mouth face, Baan doing woman, who may also wish to see contractors do. " 　　Examples: Gu Fen Chu jian a diameter, ~ old Xiaolian. ★ Qing Gu, "Chu Yuan Ying discussion about the monk to do for three decades quatrains" of the two