I mean, he didn't co-sign the loan with his Dad, so isn't technically illegal to harass him for the money? He could have just refused to pay and then called the police on the guy if he didn't leave. He had some savings and it just part time at a convenient store, so in the long run having to find a new job because the loan shark harasses his current one will still be cheaper than having to pay back all that money.
In some countries, debts can be passed on to relatives. In Japan, a debt collector can go after the next of kin to collect in case of death or disappearance.
I mean, he didn't co-sign the loan with his Dad, so isn't technically illegal to harass him for the money? He could have just refused to pay and then called the police on the guy if he didn't leave. He had some savings and it just part time at a convenient store, so in the long run having to find a new job because the loan shark harasses his current one will still be cheaper than having to pay back all that money.