The story told by Wang Ming is that in the Ming Dynasty, a man named Wang Ming assassinated the emperor in order to avenge his father. In the end, the assassination failed, and the emperor ordered a knife cut. No matter how difficult it is, I dare to continue my life. Later, it was used to describe the struggle against evil forces at the expense of one's own life. Xifeng also said this in the sixty-eighth chapter of A Dream of Red Mansions.

Extended data:

Wang Xifeng's "tough measures" are manifested in more situations and more occasions as overbearing power and indiscriminate punishment. She once punished the girl, "kneeling in the sun with porcelain tiles and not giving her tea and rice", "hitting her little hoof with a rope whip", threatening to burn her mouth with a red-hot soldering iron and cut meat with a knife.

And immediately pulled out the hairpin to poke the little girl's mouth. This kind of hair clasp is called boudoir torture device, and the girl's cheeks swell up immediately after a slap. I slapped the little Taoist again at the time of clearing the void, and I couldn't stand it. In this place, Wang Xifeng's hands are heavy, hard and fast, which is a veritable "difficult hand".

References:

Baidu Encyclopedia-I am willing to cut myself and dare to take down the emperor.