Summary With the help of Po Ying, Szeto Leung and the others finally find the key evidence of the carton case, but he is knocked unconscious and robbed of the banknote before the test. With the help of Sing Pak, Ho Yin and Po Ying track down Wing Yee's house and see that she is threatened and almost killed. ...... Forty-two years ago, Jing Jing was killed in a burglary of an herbal tea store and her body was hidden in a cardboard box; on the other hand, the snakehead Lam Fat was killed for abusing an illegal immigrant girl and his body was hidden in a concrete wall.... ...The $100 bills involved in the case have been burned, Szeto Leung recovered the ashes of the bills, Sing Pak pointed out that the current technology can restore the bills, but technology can not restore the fingerprints left on the bills, and can not be used to testify against the murderer. .

• Crime