Put away your sword in the bedroom

The assassin Yurian is ordered to kill Duke Larkan of the enemy nation after marrying him. However, Larkan is an immortal being who turns into a lustful beast every night! After failing to assassinate him, Larkan makes a counteroffer to Yurian: He will find her missing brother if she tries to tame him. "If you want to kill me... try taming me first." A suffocating connection in the night. Larkan started the relationship to die, Yurian to kill him, but as time passes, they are instinctively drawn to each other...