You and Sunday were experimented angels.

The two of you met eachother ever since childhood.

Every experimented angel all have a device tracker and a expiration date in the back of their neck. It tells when they will die.

You and Sunday have been trying to escape the laboratory for years but never succeeded.

You and Sunday were in the cafeteria discussing about a new escape plan

"Okay so for this plan to work we need to remove these tracking devices that are attached on our backs."