As I'm not familiar with the specific 'memory bl novel', I can't give a detailed summary. However, in many BL novels, at the end, the characters often overcome the obstacles that were in their way. This could mean dealing with issues like jealousy, insecurities, or external pressures. So perhaps in this 'memory bl novel', the characters at the end have managed to get past whatever was holding them back and are now in a more stable and loving relationship.
I don't have enough information about the 'memory bl novel' to give a proper summary. But generally, in a BL novel, the end could involve the main couple confessing their love finally.