Criminal case investigation team captain Lin Haoran and his comrades were ordered to bring the drug lords to justice. With a fearless spirit of sacrifice and high-tech means, they fought wits and courage with the drug lords, discovered clues from clues, and overcame difficulties. In one fell swoop, they cracked the largest drug manufacturing and smuggling case in Haizhou City since the founding of the People's Republic of China, giving us back our blue sea and blue sky.