"IRIS 2" Oh Yeon Su became in possession of four atomic weapons.

March 28, the 14th episode of the KBS mini-series "IRIS 2" featured Baek San (Kim Young Chul) revealing the specific location of the atomic weapons to Choi Min (Oh Yeon Su).

Baek San calls Choi Min to tell her, "I want to apologize for not keeping my promise during the prisoner trade. However, I will keep my promise no matter what it takes." Later, Baek San writes a letter to Choi Min that states the location of the atomic bombs where he believes the atomic weapons are.

With the help from professional agents, they rush to the Jamsil Olympic Stadium in Seoul to search the basement. Choi Min and the agents find four atomic weapons where the underground utility pipes are.

However, Baek San spoke of five atomic weapons but there are only four of them there. Choi Min becomes extremely suspicious after realizing that one atomic weapon is missing.

Baek San tells Choi Min, "I hope South Korea becomes a proud nation that possesses atomic weapons" and "I'm trying to use one to reel something in. If I want to catch big fish, I need bait" referring to the fifth atomic weapon. Choi Min replies, "If your loyalty lies in South Korea, I believe that you will return the fifth atomic weapon."