After the Tyrant Lost His Memory, He Insisted I Was His Beloved Empress

I'll write the blurb later. The story is roughly like this: The giver is a tyrant who seized power in a coup. The recipient was once a subordinate of the prince who fought the giver for the throne. After taking the throne, the giver killed everyone who had once contended with him for it or offended him, sparing only the recipient and a few others. The recipient spends every day terrified that the giver will settle scores, and assumes the giver hates him because they fought on opposite sides. He deliberately avoids the giver, but keeps running into him and can't escape. He thinks fate is playing a cruel joke on him. Then one day, the giver is assassinated and loses his memory. He forgets everyone except the recipient, insists that the recipient is his betrothed empress, and keeps the recipient by his side every day, demanding that he help him recover his memories. Later, the recipient learns that the giver loves him so much that even after forgetting the whole world, he could never forget him. The recipient once secretly saved the giver's life, believing the giver never knew who had saved him. But the giver knew all along, saw the recipient as his salvation, and had secretly loved him for many years. This is a somewhat lighthearted, somewhat heartwarming story about two people saving each other. Theme: Don't let a small good deed go undone