Jaekyung and seerim become a couple when they're at college, they loved each other back then, their relationship ended when both of them choose to focus on their career, it's when they barely met and contacted each other, they broke up after 5 years relationship. after that they never in contact for 3 years. Jaekyung is an MMA fighter, everyone knows him for his bravery and his confidence. but all seerim knows is Jaekyung still a spoiled little boy who's stubborn and short tempered.