He discovers she is the recipient of his wife 's heart and that her husband Derek ( also played by Lau ) has left her .
One night while on call in an ambulance , Ko attends a traffic accident involving Sam .
Sam discovers she is the recipient of Sam 's wife 's heart and that her husband Derek ( also played by Lau ) has left her .
One night while on call in an ambulance , Ko attends a traffic accident involving Sam .