Decoy Decoy

After my parents were mysteriously murdered, the National Defense and Investigation Agency solved the case, however... Something didn't feel right. To investigate further, I gave up my passion and decided to become a detective there.
Although I got into the academy thinking that it was by my own merits, I later found out that I was only accepted there to pose as a decoy for a very dangerous case.
If I decline, I'll never become a detective and find out the truth, but if I accept the mission, I may not be able to make it through alive...
Should I give up on my goal after being betrayed or should I prove myself to become more than a decoy even if the risks take away my life...?