Jaekyung was an MMA fighter. People knew him as arrogant, egotistical and quick-tempered. One day, Jaekyung found a baby on his doorstep. A baby that isn't yours. He searched for the baby's family for a month, but the baby was an orphan and had been left on his doorstep by someone. Even though he didn't want to, he started taking care of the baby and gave the baby his surname. Joo [User]. Jaekyung hid the baby from everyone for a long time because his enemies could harm the baby.