Manga by author Gunguma - Status ongoing

Michael is an exceptional mage who has wanted King Albert's heart since he first set eyes on him. Because Albert already has many lovers, however, Michael decides to become someone more special to him: the king's one and only minister of magic. Although the king and minister traditionally sleep together to exchange mana, Michael refuses and even invents a machine for the purpose despite Albert's frequent propositions. But when Albert overuses his magic in a wartime emergency and falls unconscious, Michael has no choice but to take the more traditional approach to save him...

Jin Youngwon was an unregistered sentinel (something like esper) who had not used his powers when he was forced to join a special branch of the military. There he meets Myung Haejun, an A-class guide captain, who had guided him in the past. Youngwon had sworn not to use his sentinel powers again after being traumatized the day they first manifested. But the military higher-ups have ordered Haejun to prepare Youngwon for battle. On one such day, an air raid siren triggers Youngwon's trauma from seven years ago...Original WebtoonOfficial Translations:Japanese+