Viola, a duke's daughter feared as a "once-in-a-generation villainess," keeps her loyal guard Kyle bound by the "Collar of Submission." Their absolute power dynamic shifts completely one fateful night when Kyle’s true identity is revealed: he is actually a prince from an enemy nation. Now a captive, Viola finds herself wearing the collar as Kyle whispers in her ear, "I won't let anyone else have you. You're mine, my dear Viola." Behind the mask of a loyal dog lies a maddening obsession. This is a dark, inescapable romance of a villainess trapped by a dangerous man.