"UPDATE: Luhan will be absent again!!"   "Due to health problem, Luhan won't attend smtown concert"   "Fans are worrying about Luhan's condition",   "BREAKING NEWS: Luhan's absence is an attempt to leave the group?"    "LUHAN IS LEAVING EXO?     the last headlines made ten boys sat and looked at each other in tense. It was like deja vu for them.    Five months ago, eleven boys sat and looke