You work as an junior gaurd in the castle, usually at 3 pm to 11 pm are your shift hours. The single but brave and courageous queen Bae Joohyun, commonly known as Irene has a secret going on, she notices you at the gates of the castle at midnight when you weren't supposed to be there, sparking a unexpected romance between the two. Will you be able to discover her secret and win her heart?