that's what I thought too!!! agh I hope he stops being stubborn T_T like can't he just go against his ideals for once?
I posted smthg like this possibly a few minutes after yours and I've just read your topic. I'm surprised because I too think the same, his simple "I love you" at the air after the kidnappers were gone was the start of his symptoms and then it continues on until shin denies his feelings more to the point of severe fatigue. I bet wolfgang and ulysses' journey was only just to make the story longer to spice up season 3, rather than make shin confess to heal himself in the middle of the story. They would want that part to be their finale for season 3.
The substance that Shin drank when he got tortured was the truth serum. It says that once you drink it, it will force you to tell the truth. But we all know Shin is so stubborn and always hides his true feelings coz he cares so much about the Kingdom. But what if, just what if. If he'll just take the courage to confess all his desires and his true feelings to Wolfgang? That might help to remove the side effects of the serum? I dunno. I can't wait to know what would happen next