"I can't because I'm alone!" Hwanwoong raised his voice as he tried to stop the room from spinning. "You're the one who doesn't understand that if I get sick, if I take a break, if I stop... Minji won't have anyone. I'm the only one who can, and will take care of him..." His head felt suddenly heavy and he hadn't even realized Youngjo's hand had come in support. "I have to..." "I will." Youngjo said, but he sounded suddenly far and unclear to Hwanwoong. "You're not alone, Hwanwoong-ah, not anymore. I'll help you. I'll take care of him. I'll take care of you." Hwanwoong is a single father who tries his best to be his son's superhero despite his mistakes from the past. One day, he listens to his best friend's Dongju's advice and he decides to pay for a babysitter who will take care of his kid while he's at work. That babysitter happens to be Gunhak's cousin and he also happens to be so perfect Hwanwoong's heart is in danger.