Watch MoviestoWatch. Kang ho who is a worker at Samjin was diagnosed with a ringing in the ears. The reason was stress. His boss told him if he became the top among the team members he will definitely get a promotion. Kang ho is actually really bad at sales. That's why he got a lot of stress on sales achievements. He borrowed money from friends and even he took out a private loan for the promotion. Those things only made matters worse.