Jaekyung and seerim have been enemies from high school, they were best friends since they're 4 years old. seerim mom and Jaekyung mom are best friends, but it's not happening to Jaekyung and seerim, they keep fighting every time they meet. Jaekyung Joo is known as a great 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.