She and he were originally from two different worlds, and there would never be any contact between them. But because of an identity swap, she became his sister.
He knew that it was impossible for her to be with him, not only because she was his sister now, but the most important thing was that she was just an ordinary woman. How can I love this proud man?
He didn't know what was wrong with him, how he could fall in love with her. This was simply impossible. No matter what, she is still her sister. For her, he forced himself to love a woman he didn't love, but when he saw her sad expression, all the hypocrisy was shattered.
How can he and she go through this difficult road of love?