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That when the MC was little, he was possessed not only during acting but in daily life. That's why he doesn't quite remember how he acted in his childhood, there's also the factor that he had to grow up too fast and wasn't properly socialized because of his family's situation. I think this because even in situations when he might seem selfish, he still thinks of the other person, like how he cares about his brother above anything, or cared for the ML so that he wouldn't get a scar (because he "knew it was the most damage thing that could happen to an actor"). Even when his messed up destiny is a product of the ML's actions, and he had grounds to believe that, he chooses trust over suspicion and falls in love with him.
The red box in the ML's room is the other side of the red string, that would have been tied to someone in their circle, otherwise I doubt he would have found it so fast and easily, as the accident occurred when he was a kid and from there his life went downhill. The ML could have been able to speak or see spirits once, and on a whim, did this. Since he has an obsessive personality, he disliked the minor antagonist from before messing with the MC, but he was sleeping with the same character in previous panels, so that leads me to believe, he had it orchestrated on purpose - so that this set would bring the MC as close to the past as possible, and shake him up completely.
Why some spirits seem to want to defend the MC? Man...no idea, but one spirit in particular pickes my interest, and it seems that someone in his past also told him about the red string of fate. The spirits know exactly what happened, they pittied him right as it started when he was a kid, and so the more they spend time together, the less the ML will deter spirits, the more "inconveniences" will be caused around him. The only dark spirit hanging around the ML, I think is the same one he saw in his childhood.
...and this is reaching, but I would be so into a plot of temporal distortion, where the spirit the ML saw was the spirit of the MC in the future... something Hill House like that ヾ(❀╹◡╹)ﾉ~