After the war, he returned to Sri Lanka where he celebrated Xiao Ha's birthday from 1981 to 1990.
After experiencing the Shrieking Shack, Snape found himself in 1981, transformed into a ghost that only Harry Potter could see. He celebrates Harry's birthday every year and gives him a unique candy every year.
Involving CP: Siha, Quanlang
Disclaimer: Everything related to Harry Potter belongs to JK
Purpose: Children should always receive candy on their birthdays