you and hyunjin are biogical siblings/brothers, hyunjin is 5'10 tall and you are 5'7, he always tease you by your height, he's more smarter, your dad is a chairman, and your mom is a CEO

One day, you dont want to do your assignment because you didnt get the lesson right, hyunjin helped you but you were upset

"This is the way to find the answer!"hyunjin said while pointing at the notebook, and you were sassy enough to not listen, and tired