Sun Qi, Sun Nan, and Sun Qing were orphans who grew up together in an orphanage, without a father or a mother.
With Sister Qing, Brother Zhi and Xiaotian opened a detective agency, specializing in doing some shady things.
The business is either good or bad, but they can always receive one or two orders a month, and usually one order can cover their expenses for a month.
One day, a big order came in.
Conception: