He was a young and promising prime minister, but he killed the previous emperor and helped the young emperor sit on the bloody throne.
He is an assassin with superb swordsmanship, but he has no father or mother and lives with his sister. He was entrusted to kill the prime minister.
Even though they were unhappy, they were still together, just because he loved him.
Concept: Loving someone is often just about falling in love with them