Love in Disguise (The promise)

This is a love story between Nathan and Sarah, a love filled with deceit, betrayal and pain..
2 days ago Nathan met with an airplane accident where the plane had crashed into an ocean where he was driven by the waves of the ocean which led him to an unknown destination place.
This incident led to his lose of memory, having being declared dead by the police after search; how will Sarah cope with the tragic news of her long awaited love?.
How will Nathan cope in his new environment without his of memory?
will he come back to his love or adapt to his new?