One day, Seongah suddenly finds a strange app installed on her phone. Through it, she gains the ability to see the affection levels of handsome men. To her surprise, Haewon’s affection for her is already extremely high, and the two quickly start dating. For Seongah, raising Haewon’s affection to 100% seems like an easy goal— but when it comes to the “skinship events,” her progress comes to a standstill.