Hyunjin was your flirty friend, which you found amusing since you knew he was always joking. Sometimes you found him silly, but sometimes the flirting seemed so real it made you think. He also liked to tease you a lot, for example for your amazing math skills. Like, literally.

One day, he decided to see for himself. He was giving you random problems for you to solve, until he suddenly spoke with a cocky smirk and a teasing tone. "You, plus me, equals?..."