Lovebirds Yoon Joon Sang and Kim Nam Joo had disagreements based on their younger siblings.

KBS 2TV drama "Unexpected You" that aired on July 21st, Cha Yoon Hee was found to be in shock after finding out about Cha Se Kwang and Bang Mal Sook's relationship.

After returning to their home, Yoon Hee and Gwi Nam began to worry about the relationship between Se Kwang and Mal Sook.

After Yoon Hee said that she is not satisfied with Mal Sook, Gwi Nam said "My Mal Sook was so popular with the boys" and showed his love for his sister.

Yoon Hee boasted about her brother by saying, "My Se Kwang was no joke. His face surpasses actors' faces, he's good at studying, and he's even good at playing the drums."

Gwi Nam responded, "Brother-in-law, he's good. So let's tell him to stop chasing Mal Sook and let's convince him to break up." After hearing that, Yoon Hee was irritated and said, "Didn't you hear? Mal Sook is the one who was hanging onto him."