A Most Unusual Suspect

A murder takes place in a small town. Scarface, a hired thug, goes to the home of Chen Yuan, a gambler, to collect a debt. During the fight, Chen Yuan kills him in self-defense. Was it a crime of passion or legitimate self-defense? As investigators look into the relationships surrounding the two men, they discover that someone sent Scarface to collect the debt from Chen Yuan. What grudge does this person hold against Chen Yuan? Let's unravel the mystery together, one clue at a time!