JYJ JunSu scared the fans by posting a picture of himself 'fainted' in a sauna room.

On 19th Junsu posted on his Twitter "I'm going to faint..." and "Hot sauna then to an ice room... completely knocked out", along with a picture.

In the picture posted, Jun Su is taking a break with a very tired expression on from the hot sauna room.

Netizens who saw the picture commented "Oppa, don't stay in a cold room!", "I initially thought you fainted so I got scared!", "where is that sauna located? I'll run there right now!" and etc...

On the other hand, Junsu is currently practicing for his 2012 musical 'Elizabeth'.

Photo Credit : Kim Jun Su Twitter