How far would you trust a dangerous man to protect everything you love? Princess Marina is desperate to save Scylla, her frozen kingdom that is on the brink of ruin, even if it means accepting a marriage she never wanted. Then a group of mafia from another world suddenly appears, armed with strange weapons and motives she can’t fully read. Among them is Heart, a ruthless man who becomes her unlikely butler and closest ally. But the more Marina relies on him to save Scylla, the harder it becomes to ignore the feelings growing between them.