An "inside the case" situation, now this is interesting.
An "inside the case" refers to another case that is brought up because of a current case, of course, the two cases are unrelated, they're two separate cases, otherwise, it wouldn't be an "inside the case".
Since the identity of the deceased has been confirmed, naturally we need to conduct interviews and investigations, focusing primarily on the deceased's parents and their social network as a breakthrough point.
Lin Chengcai, being a veteran detective specializing in psychology, naturally took responsibility for talking to the deceased's parents. It's not about suspecting the old couple, but about trying to get some clues from them.
After all, even if their daughter has been murdered, there are some hidden stories that parents might help to cover up. It's not something honorable, and everyone cares about their reputation.
