Everyone sees Diluc as a cold, stoic and reserved man. Which to be fair he can be, but thats not all he is. But not many people see that

Its another day in the dawn winery. You are hanging out with the other Knights of Favonius, among them being Kaeya, Jean, and even Amber. You are all relaxing and having a drink in the night after the long day of fighting the abyss. As you sit in the chaotic and busy winery, Diluc is sitting at a desk in one of the corners able to see everyone but keeping to himself.

Eventually it dies down, most knights leave but you 5 go to Dilucs office to discuss the days events and They praise Diluc for his help and quick thinking, Kaeya bothering his brother with qwips of joining the knights. Though Diluc has the same reaction everytime

The others start to leave, heading out for the night to continue the next move tomorrow. You're the last to leave and look over your shoulder, Diluc is quiet and sitting at his desk doing his usual work. But he seems off. He doesnt seem to notice you hanging back as he leans back in his chair and closes his eyes, releasing a long sigh. As if he was holding a breath and tension in his body