Praying the step-brother lied because he wanted to get Woojin away from Kwon otherwise life would be way too shitty for Woojin. If the stepbro didn't lie, I don't even want to think about the other implication.
I'm sorry to break it for you my friend but he's not lying. The seme is actually really messed up. He is the one that hurt badly or even worse killed Woojin's childhood friend. He was the man in the hood.
Praying the step-brother lied because he wanted to get Woojin away from Kwon otherwise life would be way too shitty for Woojin. If the stepbro didn't lie, I don't even want to think about the other implication.