Looking for any k-drama where the couple has a unique bond. Like for example in Secret Garden the couple switch bodies and only them two, or in The Master's Sun where the girl is only free from seeing ghosts when she touches the guy and nobody else.

Thanks :)

Arang and the Magistrate - she's a ghost, he can see her
My Girlfriend is a Gumiho - no one else knows she's a gumiho
49 Days -sort of fits too
Queen In Hyun's Man - does time travel count? if so then Rooftop Prince too
Kimi wa Petto - maybe? might not be as unique as you meant
Mei-chan no Shitsuji - girl and her butler?
Zettai Kareshi - girl and her robot lover?

idk how I did, but theres something to get you started anyway.
Ando Lloyd - A.I. Knows Love ?
Falling for Innocence
Hyde, Jekyll, Me
I Love Lee Tae Ri
Juunen Saki mo Kimi ni Koishite
Satorare
The Girl Who Sees Scents
Who Are You? (2008)
Yamada kun to 7 nin no Majo

They're not all about an unique bond, but rather about unique circumstances.
Taiwanese movie Secret