Their met started when Hanbin accidentally became an intruder to the castle, shocking everyone inside but not for Princess Hi. Since their eyes met, destiny was like bringing the two of them into a new world together. A world where the word "lonely" no more exists. But one big secret he didn't know, actually the princess is half a cat.

Princess Hi had been living in her castle for 23 years for some reasons. She never went outside except for the garden. All of her friends were just her maids, guardians, smartphone, and wifi (it's 2019!). While Hanbin was just a normal student who lived alone and obsessed with game.

Is there anyone to hold onto me?
Even as I look around I can’t find anyone
Where are you?
Is there anyone who’ll take me?
I can’t stand this anymore
Please come to me

The same path under the same moonlit sky
We’ll probably end up falling asleep at the same place
Now I want to be with someone
I want to get rid of this loneliness
I don’t wanna be alone anymore

Knock knock, anyone there?
(Knock knock, I’m here, knock knock right there)
Anyone there?
(Knock knock where are you?)
Respond to me
Anyone there?

I don’t know
I don’t know
I don’t know
Where the heck are you?
I don’t know
I don’t know
I don’t know
I don’t care about

Anyone over there?
What should I do as I long for you
Falling asleep without you is always a struggle
Without even lingering by my side
Where are you off to in such a rush?

Anyone there?
Don’t have much going on
But I need it every day
From this hectic city and lonely reality
Please take me someplace far
Anyone there?

I wait throughout this abnormally long night
I treasure my heart and keep it safe under the covers
As I continuously wait for you
The night you arrive
I will take it out and give it to you
Knock knock, anyone there?

Anyone who can make me go crazy
Anyone who can make me to breathe
Anyone who can make me excited
Knock knock, anyone there?