The Catalyst (An Exo Fanfic)

Oh Heara is Oh Sehun's elder sister. if there's anything that she cherishes most,it'll be her younger brother.
But one prank call changes everything.
And the Exo boys find it hard to communicate with her since then.
"Hyung,noona doesn't even want to look at my face," Sehun says and that made Luhan feel more than guilty.
he is, the mastermind of the idea,after all.
The prank and the aftermath of the prank clearly changed the siblings' relationship and not to forget, Luhan's relationship with Haera is practically jeopradized by it.
Will Haera ever forgive the boys?
and will things finally get back to normal again?
It will be revealed in THE CATALYST!