Four Seasons: Thirteen Years of Rain

Thirteen years ago, nurse Liu Zhichun was sentenced to life for poisoning two people. Fingerprints, surveillance, poison reports, the chain of evidence is too complete to be true. Detective Chen Yu knows that the only incomplete thing is time. But the procuratorate said the evidence was sufficient, the court ruled, and the case was closed. Thirteen years later, Chen Yu is no longer a criminal police officer. But he still remembered that rainy day when Liu Zhichun said "thank you" when he was handcuffed away. The four seasons reincarnate and everything flows. He wants to restore his innocence and he will never give up.