A brother and sister lived in an orphanage. They couldn't see the sun every day. The boy was very desperate. His appearance saved him. In the future they all live together. When he was in junior high school, he had to leave for some reason. He promised the boy that he would come back and gave him a gift. From then on, the boy never saw him again, only keeping his gift and looking forward to his appearance.
He met him during a lecture in high school.
What will happen to them?
Concept: ABO text