Saving that one Great General

The main character (MC) dies and reincarnates as the short-lived villainess in a wicked game the MC played. The MC had a favorite character in the game, the (older & single) great general of Dorono! Sadly, he dies during the war that occurs towards the end of the game… Now living as Airee, the MC will do everything in her power to save the general. But first, she'll have to derail from the plotline to avoid her betrothed—the crown prince—and his lover, the heroine... Contains R18, adult themes. Mature audiences only. Slow-burn.