ummmm whats going on

Tae yoon and Jae in’s ex are brothers. The ex tried to take over the dad’s business while he was weak. The dad doesn’t trust him so he turns to Jae in for info that will get him one over his son. In exchange he won’t reveal to taeyoon that he’s his father. Taeyoon finally knows what Jae in was hiding from him all this time while down playing his concerns about safety

thank you!!!