88 keys, 5 songs, and then there's you

Every night at 11 is the time Guan Lin settles down from his homework, changes into his pyjamas, snuggles into his covers and wait for his neighbour to charm him to sleep with their ever so perfect piano skills.

Or in other words, Guan Lin suffers from insomnia since forever and the only thing that can make him fall asleep is his neighbour whom he's never met when he/she plays the piano.

And his neighbour may or may not be a very charming Yoo Seon Ho who excels in piano