I'm looking for a foreign song, I don't know how old it can be from a year, 2 or 3 years old. There are 4 people in some house with a pool, two couples. And one of the girls sees that her boyfriend is cheating on her with the other, so the next day she gives them poison in their drinks as they are in the pool. The girl quite distinctive beauty, big eyes. At the end, she escapes and the boy too, but he gets arrested for killing them, because she pretends that he tried to kill her too.