Responses
I disagree. I don't think Jingi is ever going to suspect that Heonjae would betray him. He loves him too much. Jingi was abused by their uncle and Heonjae is a few years younger than him so Jingi has been protecting him. Jingi knows that Heonjae has issues (JIngi has his own problems as well) but they've always worked closely together while in prison with Jingi managing Heonjae's behavior. Plus Heonjae is kind of the few loved ones Jingi has. From Jingi's reaction to finding out about his mother died to keeping close contact with his aunt, Jingi cares deeply for his family that he's close to.
What if the reason why Jinggi wanted Heonjae to stick close to him is because he knows how thin his sanity is? He knows that Heonjae is more than capable of betraying him, so he keeps him by his side at all times and saw how down he was, which is why he was so lenient when Heonjae showed interest in Myeongil.
But you know what they say, you give a guy an inch and he’ll run a MILE
(This is me going insane because of the latest chapter hahahahahahaaaa….)