It was mentioned as a book that contained information about the Setagaya family murders, referencing a South Korean individual named 'K' and a hitman named 'R' and its findings were deemed controversial.
This is one of the people who believes they solved the case. They say in their book on this that they got in contact with a South Korean national only called K, like the letter K in the book.
— Episode: The Setagaya Family Murders
Episode: The Setagaya Family Murders
It was mentioned as a book that contained information about the Setagaya family murders, referencing a South Korean individual named 'K' and a hitman named 'R' and its findings were deemed controversial.
This is one of the people who believes they solved the case. They say in their book on this that they got in contact with a South Korean national only called K, like the letter K in the book.
And that this person, K, pointed Ichihashi to the direction of the actual killer, a South Korean hitman who is given the pseudonym R, like the letter R in this book.
Further, Ichihashi says they attained the man's fingerprints and these are a match with those collected at the crime scene by the police.