Yin Yinyin, what a genuinely good guy.
Don't be fooled by how, when Yin Yinyin discussed the plan, it sounded like he was asking White Night to do some utterly unforgivable, loathsome dirty work. In practice, when Yin Yinyin pushed the plan forward, he still kept White Night's reputation in mind, not letting him do anything outright 'unreasonable.'
See, this patsy was shameless enough that White Night could beat him with total justification.
Yin Yinyin even considered White Night's feelings, probably because he knew that, despite White Night having killed people, started fires, ransacked homes, and wiped out clans, "his heart was still pure—he was really just a good guy deep down, someone who'd never truly harm innocent civilians."
See, this patsy was so detestable, White Night could now beat him with a clear conscience.
The best part? Yin Yinyin even gave this patsy a magical identity: a relative of the Ding Family!
Brilliant!