Jin Qinghao (an Shengji) was originally a professor of mathematics in the university, but he was indirectly suspended by the school for bluntly pointing out a wrong question in the college entrance examination. For this reason, Jin Qinghao complained many times, hoping to restore his position and reputation, but repeatedly failed. As a result, Kim Ching-ho left South Korea discouraged and conducted academic research overseas until he returned home in 2006. He again filed a lawsuit with the South Korean High Court, asking the school to reinstate his professional title, but was ruled against. At this time, Jin Qinghao was in a state of extreme anger, and when he lost his mind, he ambushed in the apartment corridor of the presiding judge of the case, ready to attack the judge with a stone bow. The judge was injured and admitted to hospital, and Jin Qinghao was arrested. Under the attention of the media, the incident was escalated to a "judicial terrorist attack". But Jin Jinghao refused to admit all the charges, and in the course of his struggle, the "crossbow injury incident" became more and more complicated and confusing. The movie "broken Arrow" is based on the "crossbow injury incident", which became a sensation in South Korea in 2007.