The Duke's Obsession Leads to a Death Flag

I was transmigrated into a tragic 19+ BL novel. And as the sickly son of the family who gave the main character his trauma… If I continue like this, I’m going to get murdered by the main character who will come for revenge in the future. For a peaceful life different from the original, I took care of the captured main character with all my heart and sent him back safely, but, "I have never forgotten you for a single moment, brother."” The main character, who should have gone far away and been happy, has returned! Introduction to the Work: *Setting/Genre: Fantasy/BL *Keywords: #Transmigration #Dystopian_Sprinkle #ReverseAgeGap #Omegaverse #TransmigratedMC #SicklyMC #BeautifulMC #Savio...