The two men claimed they did not know the coral was a protected species.
He confessed to ensuring the victim died so he would go to prison rather deal with the compensation.
The pair also claimed that the man took the photos without their consent.
The man called out the company responsible for the wires following the incident.
The pair had attended their afternoon classes that day.
The chef called the Mexican and South Korean flavour mash-up a "match made in heaven".
There are records of him entering Vietnam, but none of him leaving the country.
The man allegedly "pressed his body" against her and demanded for her number.
They said seeing fewer local nurses "came as a shock".
The 21-year-old woman was seen taking a box of perfume worth S$312.80 from a display shelf and leaving without paying.