С 1, с 1: Seo Jin hosts a violin recital, where his wife performs in order to enhance the image of the company. However, the concert hall turns into chaos as their daughter, Da Bin, goes missing. Meanwhile, after Ae Ri's mom goes to the hospital for the transplant surgery, she hears devastating news from her doctor that her mom's health is not strong enough to have the surgery, and the donated heart will go to the next person on the list.