The girl hated her best friend, and hated her boyfriend even more. She wanted revenge, to kill those two animals with her own hands.
But the boy stopped her.
He said the true culprit behind the scenes hadn't been found yet, so they couldn't act now.
If they were going to kill, they had to wipe them all out at once.
From then on, their small family of three people became just two people.
And those two people's sole purpose for the rest of their lives was revenge.
The girl deliberately bought an apartment on the 18th floor.
From the day her sister died, she was no longer human.
She was an evil spirit from the 18th level of hell, suffering torment every day, thinking of revenge every day.
She wanted to divorce the boy, not wanting to drag this poor boy down with her.
The boy refused, and handed the girl a lab report.
"Darling, I have cancer... I don't have long to live."
He smiled, but tears flowed from his eyes.