A woman puts everything on the line to achieve her goal of being able to move into a luxury penthouse in the Gangnam District. In the process, she gradually finds herself turning into a monster.

In an alternate-reality South Korea, where a constitutional monarchical system prevails, Oh Sunny, a musical actress, becomes the empress of the country. Thus begins a dispute for power in the royal palace. Nothing is what it seems, and Oh Sunny is ready to fight until the end to uncover a mysterious homicide within the royal palace, fighting to protect those she loves the most and obtain happiness.

Love is as tough as it is sweet for a lovestruck teenager, whose relationship with her next-door neighbor transforms as they grow into adulthood.