["I'm going to destroy you" - Ko Yu-jeong's ex-husband's murder case] On May 25, 2019, the father, Mr. Kang, headed to Jeju Island to meet his six-year-old son after two years. He couldn't hide his excitement and was the happiest person in the world In an instant, he is separated from his son forever... Where did he disappear to? The police, who started an investigation with Kang's younger brother's missing report, secured the scene of Kang, his child, and his ex-wife, Ko Yu-jeong, entering the pension together with a nearby CCTV. However, Kang There is no appearance of Mr. coming out of the pension! Afterwards, it was revealed that ex-wife Yu-jeong murdered her ex-husband Mr. Kang in the pension. The circumstances of the planned crime are revealed one after another, such as the purchase of crime tools, Internet search words, and the form of bloodstains at the crime scene! The police are unique. We searched the place where Jung was supposed to have damaged or abandoned the body, but in the end, we couldn't find Mr. Kang's body.In this situation, what was the smoking gun that clearly proved Ko Yu-jeong's planned crime?