There are four color codes in , which are Red, purple, yellow and green.

Code Red (Killer): The killer who kills people is Code Red. He is a hired killer like those seen in movies. The things he sells are lethal weapons, items that killers need.

Purple Code (Spy): A code exclusive to those who buy and sell intelligence, various eavesdropping devices to release secret camera equipment, simple weapons and suicide supplies that can cause a painless death when discovered.

Code Yellow (Aftermath Providers): Medicines, detergents, and cleaning tools needed for treatment and aftermath, as well as various plastic surgery services that can evade the law.

Green code (who does not belong to any type of person): Those who obtain the code from the assisted murder website must not attack the green code. If someone violates this rule and attacks the green code, everyone who obtains the code must protect the green code desperately.

In the play, Zheng Jinwan and Zheng Zhian are green codes. They are the people who have codes in the website and the killer must protect them and cannot attack the green code. Therefore, it can be speculated that the attackers Zheng Jinwan and Zheng Zhian encountered are likely to haveThe coder may also be a person without a code, but it is more likely that a killer with a code rebelled, because Zheng Zhi'an will be classified as a green code and needs the protection of other killers, which means he is an organized person.Attack green code, otherwise if it is only attacked by ordinary people, the code killers in the organization do not need to protect green code?