「incidents are not caused by human where accidents are」
The story starts with a car incident. The traffic police arrived the scene to take statement of the driver “Law Yau Hang” and two witnesses “Yan Sum” and “Yau Yung”. The traffic police found out Law Yau Hang was his relative and discovered this was not a simple car crash.
As the relationship amongst the characters progress with time, like love happens in a sudden moment, the incident starts along with it.