Tiffany Hwang has a heart problem and she's at the hospital. Her girlfriend, Kim Taeyeon had an accident before her birthday. While Taeyeon was in the train station after she withdrawed the money in her other bank account, something tragic happened. The thief got Taeyeon's bag ,her ids, passport and all of her money were there. The thief fell off the railway and died. The citizens concluded that the person who died was Taeyeon which was not actually true. Now, the whole world knew about the incident and Taeyeon just can't pop out suddenly because she needs to pay for Tiffany's operation, she had to pretend that she's dead so that her last will and testament will be valid. She gave Tiffany a large amount of money in the bank. If Taeyeon pops out suddenly, her last will and testament won't be valid and Tiffany's life will not be spared.