C77 Rejuvenation

"That's right, it's actually not difficult at all. But with these few points combined, this seemingly simple case has turned into a result that we can't fathom. Now it seems like the murderer is quite courageous, he has been gambling with us …" I know what Luo Song meant by 'gamble'. In fact, he was gambling on the murderer in Cheng Yi's case. If it wasn't for that handkerchief