"Excuse me!" Sanghoon exclaimed. "You say that like it's common to you. As far as I know, your only job is to extort information and blackmail those men Mr cha wants to get rid off."
Da-hee smiles and says in response. "Well I can see that you've been doing your homework, and here I thought you were just biding time so you could screw my sister."
Irritated by da-hee's manner of speaking, Sanghoon became enraged and raised his voice; "That's enough! Do you also kill for the Styx gang? If you do, then you can leave the same way you came. I can overlook whatever sketchy way you use to control people, but I will not work with a murderer."
"Calm down. I was just making a suggestion. You may not believe me, but I haven't killed anyone, yet.... I promise." She says as she stands up from the couch and moves closer to him. She could see that she may have gone too far and sort to reduce the tension she had created. "If you have any bright ideas on how to bring Mr Cha down then I am all ears; I have thought of everything, and at this point I am at my last resort."
At that moment sanghoon felt that da-hee may be very afraid of Mr cha. (At least a part of her is still a normal teenage girl) he thought to himself. "Maybe you're too close to it, you're in so deep that you can't think outside the box. I can help with that."
They moved apart from one another and sat at opposite chairs and then da-hee asks. "How so?"
"Everyone has a weakness."
"Oh my goodness." Da-hee says under her breath. She knew where this was going and she was already disappointed.
"Hold on, I know you think this is a dead end but it's not. There's a general rule among humans, we all have weaknesses and that weakness can be our downfall, if used correctly by our enemies. Now, you are good at figuring others weak points but in this case, you just don't know how to use it and that's how I can help. In Mr cha's meticulous way of life, what is his one failing system?"
Da-hee paused for a while and then she answered. "His son, tats. He...he was obsessed with his mom, always sort to control her as he controlled everyone; but it ended very badly. Now his relationship with tats is horrible, he can't control him and it drives him mad. Only when he's with his son that he loses his composure."
Sanghoon leans in; Finally, he feels that this could lead somewhere. "Good, I need you to tell me in great detail about their relationship."