On April 12th, SM Entertainment reported that WINTER underwent pneumothorax surgery and is recovering.

WINTER is recovering from recent pneumothorax surgery. As the disease is prone to recurrence, the decision was made after sufficient discussion as a preventive measure based on the opinions of the medical staff. Future schedules will be made with WINTER’s recovery status as the top priority.

Pneumothorax is when air gets inside your chest cavity and creates pressure against your lung, causing it to collapse partially or fully.

Earlier on April 9th, KARINA and WINTER were photographed at Gimpo International Airport. They were returning from Japan after finishing their overseas schedule.