AOA performed at Fortnite Korea Open 2018 today. After performing "Like A Cat", Seolhyun is visibly unwell. After she is being helped off stage, Jimin says Seolhyun is suffering from the flue.
source: Spinel CAM, 비몽
Get well soon Seolhyun! Seems like the flue virus is going around, Ryeowook and Golden Child's Bomin also caught influenza Type A this week.