the mother gave birth to twins.. they got separated as usual.. of course the parents does not make a police report.. someone else find the other baby and adopt/ start raising the child as their own.. one day after 20 years (or 18 or 25, not more than that) they saw each other and they realise that while one has become a policeman, another one has become a thief .. the funny thing is they will only meet after 20 years.. not before that