The murderer is a cousin. Diao is Ai Qing's cousin. The reason is that it is the killer's intention to open five. They are all four paintings, but the words haven't changed. The ideograph is eight paintings, and people and cranes add up to eight paintings, which should mean cousin.

Plus the word "and" is equivalent to adding the strokes of the word "people and hanging", so it is estimated that the murderer should be a cousin. If you press the nine-key pinyin, it means that people are uncomfortable with hanging out, and conversely, it means that people are uncomfortable, and the poor word is sister.

Extended data:

Ten deadly sins is a mystery novel written by the writer Spider, including prequels, and subsequent works, Ten deadly sins 2, Three deadly sins, Four deadly sins and Five deadly sins. The book is adapted from a real case, and the place names involved are all pseudonyms.

Four maverick super policemen, Liang Shuye, Hualong, Baojian and Su Mei, the protagonists of the top ten capital crimes, form a spider case group to investigate the murder cases that are difficult to solve in the face of extremely abnormal and twisted criminals.

In addition, the cases in the novel are all intercepted from real life, with their own literary embellishment, but some cases were invented by the author himself, and an online drama "Ten Deaths" was also launched on the basis of the novel.