"IRIS 2" Even though Jang Hyuk's memories have returned, he develops a personality disorder from the gunshot wound.

March 21, the 12th episode of the KBS episode of "IRIS 2" featured Jung Yoo Gun (Jang Hyuk) coming across another problem after his return to NSS.

After a year after he disappeared after being shot by an IRIS sniper, Jung Yoo Gun returns to NSS after his memories return. However, he is arrested for the acts of terror he participated in when he believed that he was an IRIS agent. When the investigation on Jung Yoo Gun does not go as well as they planned, the director of NSS (Kim Il Woo) takes matters into his own hands.

The director plays an audio file that contains evidence that Jung Yoo Gun had killed Park Cheol Young (Kim Seung Woo). The director asks him why he killed him but Jung Yoo Gun says, "I didn't kill him. I didn't shoot the gun. I'm telling the truth right now" and suddenly breaks the tape recorder.

Choi Min (Oh Yeon Soo) suggested a possibility that Jung Yoo Gun may have developed a personality disorder from the gunshot wound. Choi Min declares him innocent but keeps an eye on him.

Jung Yoo Gun shows signs of violence again when he discovers security cameras inside of his house. He breaks every single camera and attacks Seo Hyun Woo (Yoon Doo Joon).

As featured in this episode, Jung Yoo Gun's memories may have returned but his personality has definitely changed.