Just what does Jihyo noona mean to Kwang Soo? His Jihyo noona was a very unpredictable person, she came to the show smiling brightly but in reality, she was very quiet. She usually kept to herself and he sometimes wondered how he had gotten closer to her immediately, he thinks as he looks back on their friendship. Of course, Joongki played a part in it too, he had acted out as a catalyst, but his Jihyo noona also took the courage and initiative to get closer to him. Maybe it was because of his face? The three of them as maknaes of the show sometimes grabbed breakfast together and even if Joongki wasn't around, the two of them - him and his noona- would still continue on with the ritual and eat breakfast out together. 

With that ritual, the three of them had begun to drift closer, getting even ore attached to one another. Maybe their friendship had become deeper when Joongki left the show, he and his noona shared the same grief and became each other's source of strength. 

Without even noticing, years have passed nd he and his noona had become closer than ever, like a real family. Their relationship became defined as a real life siblings relationship kind and he couldn't agree much more because this is what they really were. Jihyo noona was strict like a mother and father combined, she had the heart of a mother - soft when it came to her children's pleas- and the hard heart of a father - disciplining his children- but he knew that she does that for him. It's her way of looking out for him and making sure that he'd stay grounded. She was an older sister too, someone he could rely on when he was troubled, someone he could lean on and share a laugh with, someone he could t