As of episode 10.
1. Taegu's daughter was probably kidnapped by the New Union; OR, was probably killed by the New Union BUT they fed him false information that it was the NIS who did it (probably collateral damage, and Do “404” Hoon was the one who made the mistake)
2. When he met Min Seo, he “got lost” because he's remembering his own daughter in her.
3. Also, Taegu is not a cold killer.
Their childhood was destroyed. They were all eliminated, too. Got a family of his own. He wouldn't do to other children what the Union did to them.
4. Taegu was probably not the killer of Yu Ra's parents.
I'm suspecting:
* Taegu was there to save her parents but was too late.
* Or, Taegu was ordered to clean up.
They need to discover the truth behind the following before they start killing each other:
a. Who actually killed Yu Ra's parents?
b. Who is calling the shots in the New Union?
c. What actually happened to Taegu, and his daughter?
d. Why is Taegu so loyal even though he is aware that thee New Union will order the assassination of its own members, like Wolfe.
e. What is it that is making Taegu think the New Union will never hunt him down, and he “found his way back” after seeing his “office”? (He was very scared. His daughter is more likely still alive.)
f. Who are the mysterious guys Director Oh is reporting to. What is there relation to the New Union?
Remember when Oh said that their (Oh and Do Hoon) profiles were from the office? They have a double agent in the NIS. Which means, either the mysterious man or group behind the Old Union are the still in the Intelligence business, or someone is playing them all and is actually the new head of the New Union. This last bit, I'm suspecting this is the guy who ordered all the kids to be killed contrary to Bullet's choice to save them.
