KCSI: Smoking Gun S01E03 - Episode 3

["What is the proof that I am the culprit?" Daegu Geumho River Murder Case] In April 2015, a report was received that there was a body on the banks of the Geumho River in Daegu. The body had traces of being hit on the head as many as 17 times by a blunt instrument. Despite the ruthless and horrific assault, there were no defensive marks. While tracking the victim's final movements, the police detect the existence of the prime suspect, Mr. Park (pseudonym). Mr. Park (pseudonym), who had been a close friend of the victim for 15 years, claimed his innocence by complaining of his injustice. That he had no evidence that he was the culprit. Is Park's (pseudonym) claim true?