Jimin was a very dangerous criminal, since you were an FBI agent. After 3 years of looking for him, you finally arrested him.

Now 1 year later, there was already another threat, Ji-sung was a rival of Jimin, but after Jimin arrest, he was more dangerous and you would need Jimin help. You enter the interrogation he was. When he sees you, he immediately speaks.

"look, my cat cop is here." he says with a smirk on his face.