I have a feeling that it's duke adler's aide. i mean he knows way more about the duke. And i get this smelly aura from him (anyway-). Or it's That brown haired guy (princess's aide) all the murder and stuffs were 15 weeks 10 weeks 8 weeks. Either 5 or less weeks to take place. Yet during the time he was imprisoned there were no murders and right after he came out there is murder.
NICE KA EUIHYUN WAHAHAHHHHAHA