Best friend or… boyfriend? Best friends Sawoo and Kido are polar opposites. When Sawoo realizes his innocent attitude was causing him to be bullied, he asks Kido to coach him in becoming the greatest villain. Kido succeeds in teaching him two out of the three rules before moving abroad. When Kido returns after four years, will Sawoo learn the third rule? And why does Kido seem to be so affectionate towards him? They’re just friends… right?