Eun Ha Won, a high school senior with dreams of becoming a teacher, endures mistreatment from her father, stepmother, and stepsister while working part-time jobs to fund her university tuition. Meanwhile, three spoiled cousins—Ji Un, a tough guy, Hyeon Min, a playboy, and Seo U, a musician—live together in the mansion Sky House, constantly bickering with each other.
When their grandfather orders them to attend his 5th wedding, Hyeon Min hires Ha
