Following his hospital visitation, H.O.T member Tony An took the time to thank MBC 'Infinity Challenge' staff via Instagram on February 6.

In regards to the location change for H.O.T's reunion performance, Tony mentioned, "It was shocking to find out so many had applied for seating reservations in advance, so many people might not be fully satisfied...However, I would like to thank all the 'Infinity Challenge' staff for working hard to provide the best for fans."

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As for his health condition, Tony added, "I received treatment and am taking medication. So please don't worry!" reassuring fans.

Meanwhile, the 1st-gen idol group is currently preparing for their highly-anticipated reunion on February 15 at Seoul Olympic Park.

Previously, the staff relayed that the location was changed from Ilsan's Dream Center to Olympic Hall for better viewing purposes and seating accommodations.

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A post shared by Tony An (@tntonyan) on Feb 6, 2018 at 2:56am PST