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 definitely got 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 made him get worse from a ringing in the ears. One day, he realized even if he got a promotion he was still around with stress. So, he locked himself in the box. Finally, the ringing in the ears stop. However, it comes again.