Read Landlord's Little Girl Manga:
Yu Dal-li (Darla), the daughter of the landlord and girlfriend of the school gang's boss, is the absolute power to the tenant, Jun-pyo (Junnie). She always treats him as a peasant at school, but when only the two are left at home, they take a completely different attitude... The complicated jealous relationship of two childhood friends who grow up within their harsh family and school ties.