Tbh I think it's no surprise that TS got mad. I mean in fact his boyfriend did a background check on his best friend behind his back, just because someone they knew said something. And to top it off, he also lied to him while he did the investigation, also the fact that they grew up together matters a lot as well. Of course TS knows that JH did many dirty things, but he is also aware that for a long time JH didn't have a choice if he wanted to survive. So for him it looks like the MC tells him to be suspicious of JH, without knowing in what kind of environment they grew up in
Tbh I think it's no surprise that TS got mad. I mean in fact his boyfriend did a background check on his best friend behind his back, just because someone they knew said something.
And to top it off, he also lied to him while he did the investigation, also the fact that they grew up together matters a lot as well.
Of course TS knows that JH did many dirty things, but he is also aware that for a long time JH didn't have a choice if he wanted to survive. So for him it looks like the MC tells him to be suspicious of JH, without knowing in what kind of environment they grew up in