'Goyangsoon', who is born fat, enters Dr. Park's diet club because her parents criticize her lifestyle. Although Dr. Park seems suspicious, her history is more reliable than anyone else's. This place boasts a 100% success rate, and there is only one condition for leaving: 'You must lose weight to reach your goal' Will Yangsoon, who weighs over 100kg, be able to successfully diet and leave this place with a smile?!