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Only close family members were informed of the truth. An attack from the Abyss Order was told to be the cause of death to others. Kaeya would've probably laughed at the irony of that.
The funeral was quiet, apart from a few cries. Everyone around Mondstadt, from the older men and women, to the Spark Knight, were there. The one that wasn't there was Mika, who claimed to 'have a cold'.
People around him suck at lying, don't they?
After that, a letter was sent to Varka, who expressed his sadness and condolences for Kaeya. However, things weren't easy, and he couldn't come visit either. Sad, but not surprising.
The Abyss Order distanced itself from Mondstadt after that. He didn't have much of a job as the Darknight Hero now, which bored him.
A few events were made as a way to celebrate the slight sense of peace, and to grieve the Alberich's death.
Children saw it as an excuse to play, and adults saw it as an excuse to drink. Angel's Share was particularly busy, but Diluc was doubtful of the truthfulness of the cause.
Every time, after his shift, when returning to the Dawn Winery, he couldn't help but look at the last letter Kaeya had sent him. When Jean handed him the letter, telling him she found it in Kaeya's drawer, fear stopped him from reading it, and it had stayed like that for a few months.
Mondstadt wasn't grieving anymore. The streets were back to normal, with the cheerful singing inside the church resonating all around them. The Abyss Order was back in track, which somehow, gave relief to the people close to Kaeya.
Diluc wasn't used to smiling, so his anguish wasn't noticed.
On a Friday night, right after doing his job as the Darknight Hero, not because he wanted to, but because he had to, because the Knights of Favonius were so… Utterly useless, anger fueled him to open the letter.
He knew this so desired read would bring him pain, yet he opened the envelope, with his hands shaking slightly.
To whoever this letter might find:
Sorry for making you worry, all of you. I decided to play with fate and fire, and if you're reading this, then I assume the outcome was victorious. Of course, such knight as me wouldn't even think or like to do this, but my experience in life was rather… Boring, per se. I'm simply disappointed, as I was expecting something more entertaining for my years.
What is the point in continuing, when you don't have something fun to do? Exactly. This was what was meant to happen, and I simply helped destiny out a little bit. Not my fault I'm a mortal, right?
Thanks for the love, all. Don't miss me too much, will you?
— Kaeya Alberich
However, he wasn't prepared to feel angry. He wasn't prepared to feel some kind of hatred toward his sworn brother who killed himself, but in that moment, he did.
Anger because he knew Kaeya didn't want to say all of this, because Kaeya didn't mean this. He sweetened up all his words with lies, and it hurt. Even after death, he couldn't let the mask fall, and he acted like dying wasn't such a life-changing experience. Kaeya acted like his life was a game, and the letter got that message through in a painful manner.
Fun? What kind of fun?
Was his boredom a lack of motivation to wake up every day, or was it just a lack of ‘fun’ in his life? Doesn't that end up being exactly the same?
Did he mean happiness, or was he genuinely bored? Did he wish to accept himself, or was it too boring to be healthy, safe, and happy? Was that it? Is that a reason to kill yourself?
Diluc knew Kaeya didn't mean for it to sound like that, but for his own comfort of faking confidence, it did. Diluc knew that sense of emptiness, but he kept living, and he was angry that Kaeya couldn't hold on a bit more time so they could say sorry to each other, so they could tell each other their troubles, so they could be honest.
Even after death, Kaeya lied.
That is what Diluc hated about his brother.