Very often, the male ego gets hurt when a wife earns more than him. In fact if such issues are not addressed on time, this can even ruin the whole institution of marriage. Thanks to a combination of societal expectations and deep-set ideas about gender roles, many relationships don't fare well when the wife brings home more bacon.
The wage gap is a battle that's yet to be won but In this episode Luchi and Ope did justice to it.