A Prank Turned into a Murder

"Bloody smoker!" Zhao Yu said fiercely. "You thought that if we found your cigarette butts at the crime scenes, they'd be invalid evidence, so the police would not go too deep into investigating it! But, you were wrong, as these cigarette butts are actually your fatal mistake!"

He then added, "Our forensics team has tested the butts, and soon, we will know whether you boarded Yongjin Island before, after, or at the same time as the inciden! How about that, Captain Dou?"

Zhao Yu then narrowed his eyes and said, "As you have caught so many criminals, you should know that they have only one result in the end… They are caught! So, stop fighting in vain, as we have both your motive and sufficient evidence now!"