DXC is Yin-Yang.
Yin cannot live with-out Yang, Yang cannot live with-out Yin.Good can't live with-out Evil, Evil can't live with-out Good.
Yin-Yang means that Good always has has some sort of Evil and vise versa with Evil, Evil always has some sort of good in it.
Duncan & Courtney:
Duncan is bad, Courtney is good.There is some good in Duncan, and some evil in Courtney.Duncan can't live without Courtney, Courtney can't live with out Duncan.
They amor each other, My geuss well they will never leave each other.No matter how much one bugs the other.
Conclusion: Duncan&Courtney is Yin-Yang, I amor Yin-Yang.