Mr. and Ms. Perfect

de·lin·quent
dəˈliNGkwənt/
adjective
1.
(typically of a young person or that person's behavior) showing or characterized by a tendency to commit crime, particularly minor crime.
"A story about delinquent young men and women."

Change
CHānj/Submit
verb
1.
make or become different.
"A story about someone who seeks to change one's life."
2.
take or use another instead of.
"It is at that moment that the two of them decided to change their lives."

hide1
hīd/Submit
verb
1.
put or keep out of sight; conceal from the view or notice of others.
"But in order to do that, they had to hide their past life from everyone else."

No one should ever find out and the two of them will have to work together to keep it that way.