As two women, the mother-in-law and the daughter-in-law were unrelated in the previous decades. It is only because they both love the same man that they become a family. Therefore, the relationship between mother-in-law and daughter-in-law is not a relationship between two people, but rather a triangular relationship more complex than a triangle romance. In a triangle romance, one party is always the one not being loved, and eventually one person will back out, so it is relatively simpler.