U-KISS member AJ shocked fans today after suddenly revealing that he underwent secret heart surgery.
The 23-year-old idol posted a photo on Twitter of his arm with an IV drip wearing a hospital gown with the message: "After the heart surgery, I am in recovery."
Details on the singer's surgery are scarce, but a spokesperson at U-KISS' agency NH Media tells IdolWow!: "It’s true that AJ had heart surgery. He is recovering now and please wish him well."
AJ -- whose real name is Jaeseop Kim -- has kept a relatively low profile since going on hiatus with the group to study at Columbia University in New York City. The last time fans heard from him was an excited tweet on May 13 about completing his freshman year.
Fellow U-KISS members and new addition Jun have been actively promoting new album "Mono Scandal". However, it seems they were unaware of AJ’s condition.
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Soohyun replied to his surprise tweet, "What is this, what’s wrong?" And the others are wishing him well. Member Eli tweeted, "Jaeseop, be strong" while Kevin wrote, "I'll be praying for a quick recovery! Don't be sick."