The members of Girls’ Generation can always be seen covering Sunny’s ears due to a traumatic experience in her past.
In the past, Sunny has explained that she lived in Kuwait when she was a young child.
She wasn’t even 1 year old, yet she and her family were living through the Gulf War, which she believes is the cause of her trauma with fireworks.
If there are unexpected fireworks on stage, it’s clear that Sunny is affected by the sudden bursts, which sound similar to explosions.
Thankfully, all of her group members know to cover her ears during ending performances, where concerts close out with impressive fireworks displays.