Shadow of the Affair.

Nisa is a guide girl who works for the travel agency Happy Korea. Pongsathorn is the manager of Royal Airlines and a very ambitious person. Their first meeting in Korea is like destiny and they both fall in love. But Pong betrayed Nisa's trust by choosing to marry Viriya, the daughter of the owner of Royal Airlines, instead of her. So Nisa decides to change herself and hide in the shadows... waiting for the day to come back for revenge.