Yang Lin is an exchange student at an England university who comes back to China because of news of her father's potential suicide by falling from a tall hospital building. Refusing to accept the fact that her father committed suicide and believing it was murder, she sets out to determine the actual cause of her father's death. This leads her to cross paths with the last person whom her father had a phone conversation with, Jiang Hai Yang, who coincidentally introduces her to the people who have the key to her family's secret past, including a long lost sister.