Hanbin and Yoonhae had been friends since they entered Pre-School. Yoonhae's a bubbly person that could make people around her smile and turn their bad day into a good one. While Hanbin, he had a difficult time making friends. He's a shy person. Both complement each other very well. We could find out how they complement each other through this story.

Once they entered High School, everything remained the same except one. Their feelings for each other.

Kim Hanbin

Lee Yoonhae

Oh Eunhae (Yoonhae's bestfriend)

Rest of iKon

Pictures ain't mine. Use it for only reference. :D