Title: Young Investigator

Summary:

A young investigator decides to re-examine a case he believes has wrongfully incarcerated an innocent person, who was also his childhood sweetheart, the daughter of a wealthy businessman. As he investigates the case and is assisted by an unknown dark figure, he discovers that he is entangled in a conspiracy to exonerate the girl, who is indeed guilty. His dark "benefactor" ultimately turns out to be the girl’s brother, who wanted to take his parents’ fortune into his own hands.