On March 12, NMIXX's agency, JYP Entertainment, released a statement announcing that member Sullyoon will be sitting out of KBS music program "Immortal Song's" recording that was scheduled for March 13 due to health reasons.

According to the statement, Sullyoon experienced body aches and colds on the morning of March 12, which has then been diagnosed as flu by a medical professional. While Sullyoon has almost fully recovered, medical professionals have recommended that she refrain from excessive activities and thus will be taking a break, sitting out of "Immortal Song's" recording.

The full statement reads:

"This is JYP Entertainment.

Firstly, we would like to apologize for causing concern to the fans ahead the release of NMIXX's 1st EP.

This is an announcement regarding NMIXX member Sullyoon's health and future schedules.

Since the morning of March 12, NMIXX member Sullyoon experienced colds and body aches and have been diagnosed with flu at a hospital. She has also been treated and prescribed medication.

With that, it wouldn't cause any disruption to her normal daily life, but the medical professionals have recommended that she should refrain from excessive activities and thus have decided to take a rest.

Therefore, we would like to inform you that Sullyoon will not be attending KBS 'Immortal Song' which was scheduled to be recorded on March 13.

We put our artists' health first and will do our best to aid her recovery.

We ask for your understanding.

Thank you."

Wishing Sullyoon a speedy recovery.