Shin Won Ho and Gong Yoo's relationship has been confirmed.

In the 10th 'Big' episode that was aired on the 3rd, confirmed that Kyung Joon(Shin Won Ho) is the real brother that was born for Yoon Jae(Gong Yoo), shocking the viewers.

On this episode Se Young(Jang Hee Jin) accidentally over hears Yoon Jae's mom Hye Jung(Kim Suh Rah)saying over the phone "That kid was only born to keep our Yoon Jae alive!"

Se Young, who questions what she over hears, conducts a genetic test and confirms that Kyung Joon and Yoon Jae are brothers. Hye Jung who wonders about Kyung Joon's state asks Se Young how he is, Se Young responds to her saying "He's your son isn't he? He's the boy that Yoon Jae has been looking for. Did he look for him because it's his little brother?"

Hye Jung tells Se Young "When Yoon Jae was 12 he got really sick, so we needed a little brother of Yoon Jae to keep our Yoon Jae alive. I couldn't have another child, so the women who my husband loved had the child instead. And the child is Kyung Joon."

"Kyung Joon is the child who was born to keep my Yoon Jae alive. He is not my child."

Se Young hearing the shocking truth proposes to Hye Jung "Shouldn't the child know who he saved? Shouldn't Yoon Jae know who saved him?"

Hye Jung then replies "Don't interfere. I don't want the two to meet. The two will never know the truth."