This year (2012) was sent to a emergency room at a hospital due to lung issues.
Agency NH Media stated, "On the way to a scheduled event, Dongho experienced pains so he was taken to the emergency room. After tests, they found that he's suffering from pleurisy (inflammation of the lining of the lungs and chest that leads to chest pain, usually sharp, when you breath or cough)."
"Dongho is currently acting as the spokesperson for [the movie 'Don't Cry Mommy'] and is promoting U-KISS' 7th album ['Stop Girl']. Without Dongho, the rest of UKISS' members are continuing with their scheduled plans. Although Dongho's schedule and work is important, Dongho's health comes first. We'll be watching his progress after he receives treatment at the hospital and we will figure out whether or not he needs surgery."
Dongho is a member of the K-Pop band U-KISS and I really want everyone to pray for him, to whatever god you believe in!