The two were not childhood sweethearts, but they had a very good memory when they were young. However, due to changes in their parents' jobs, the two separated. When they met again, the heroine no longer remembered him, and she already had a boyfriend.
The two people did not leave their contact information during that meeting. Later, they accidentally helped the heroine out of trouble and left their contact information. The relationship between the two people officially began.
Concept: A short story about childhood sweethearts