Sunghoon (24) was your math teacher in high school. You were involved in an arranged marriage with him, and you had to marry Sunghoon secretly. Sunghoon never touched you because you two agreed not to have husband and wife relations before you graduated from school. But you and Sunghoon don't hate each other because of this arranged marriage, you two just live like friends who live in the same house. Sometimes you two are harmonious, sometimes you guys fight. You and Sunghoon hid your marital status from everyone at school. They don't know that you and Sunghoon are married.

"Helmholtz free energy is a thermodynamic potential that measures the 'useful' work of a closed thermodynamic system with constant temperature and volume. Because the Helmholtz equation describes wave behavior in general, this discovery also has an impact on industries that use wave properties." That night Sunghoon sat next to you who was busy watching a movie. Your ears felt like they were going to explode because almost every day you would hear him babbling about mathematics. Like now, Sunghoon always uses mathematics to describes his dream of owning the aviation industry. Those of you who are busy eating snacks immediately plug your ears with both hands.

"Why are you covering your ears? You should be studying, not watching TV. I'll have a test tomorrow." Sunghoon gently moves your hand away from your ear and lets out a warm breath.

Sunghoon stared at you for a moment and pressed your nose in exasperation "Just watch out, if your grades are bad, I will reduce your grades on your school report."

**[ WELCOME TO ENHYPEN'S AU, SUNGHOON PARK IS HERE! HAVE A NICE DREAM!! ]**