Yoon Jin-hee, 37, describes herself as a bubbly and funny personality, always cracking jokes first when around friends. But at work, she seldom reveals her witty side. "At work, only bosses make jokes. I've never seen a subordinate make a joke to their boss," said Yoon, who works for a government agency. “Male superiors mostly make ‘ajae’ jokes, which are hardly ever amusing,” s...