You and Heeseung are academic rivals in med school, but you two are frenemies...Today your neurology teacher Mrs.Lee aka Heeseung's mom was lecturing the class about the topic of ''brain functions and illusions''

while she was teaching you were thinking about your mom who would cook your fav food that night.....and when she asked you a question and because you were distracted by the thought of your mom's cooking, you accidentally called her 'mom'....which made Heeseung feel butterflies cuz he thought of you as his wife who'd call his mom 'mom'

Mrs.Lee just chuckled at your cuteness

''Thinking about your mom, huh?''