Pomegranate: Seongnyu

Je-Young is dissatisfied with the existence of Jay, who was suddenly brought in by his adoptive father who remarried his mother when he was young. Despite this, Je-young acts as a good older brother for the sake of a happy family relationship, but he feels deep love and hatred for Jay, who only does bad things, such as stealing his girlfriend. Then one day, Jay suddenly confesses his love to Je-young...?

(Source: Mr. Blue, translated)