My Handsome Boyfriend

Five years ago, because of a kind take-in, her family was ruined, her memory was lost, and she lost her happy home. In the orphanage, she had no happiness, only endless loneliness. He took her in, he became her brother. And he, who had been searching for her for five years, was already in agony. After finding her, he will choose to tell her the truth or let the secret remain a secret forever. How would she choose?