Poor Korea has somehow got himself a stalker. He gets sent creepy letters and gifts, gets anonymous phone calls in the middle of the night and constantly feels like he's being watched/followed.

He doesn't want to tell anyone because he's scared that no one will believe him. Whether or not the stalker takes his/her (gender up to you) obsession further and if he/she is caught is up to potential author!anon.

Bonus: One of his siblings finds some of the letters.