Cao Huiling and Cao Haoyue's relationship was neither warm nor cold. The two coexist only because they shared the same family name and were part of the same family.
However, if one were to take that off of them, then, the two would definitely become two rivals who never want to see each other!
Actually, Cao Haoyue did not have any qualifications to compete with Cao Huiling, the Eldest Miss of the main branch. Aside from being prettier than the latter, the former could only swallow the disadvantages that the second branch possessed.
But this inferiority complex surged out a fire that could never burn out. It continues to engulf Cao Haoyue's heart and choke her with the reality that no matter what she does, she will never be better than Cao Huiling.
This is why, even though Cao Haoyue hated her so much that her guts turned green, she could never openly go against and deal with Cao Huiling.