okay man where do i start, alright.

so first things first, Weishi is a 5* polearm user from Liyue with a Pyro vision. The general gist of his story is that after the death of his older brother, Weiai, who was killed by an assassin, Weishi swears to seek revenge by taking the life of his brother’s killer in turn - an eye for an eye is only fair, after all. it’s when he commits himself to this oath that his vision appears, a moment’s ambition to drive his journey thereafter

so he leaves on a manhunt, and his journey takes him several years (he’s 18 when he leaves home, and about 2 years passes, so he’s 20 at this point). At first his motivation is strong, his conviction clear, but soon after he starts getting tired of dragging himself halfway across Teyvat on the trail of someone he might never find. Teyvat is huge, after all; how is he supposed to find one person in a sea of millions? and while his determination may have been strong enough to grant him a vision, it certainly wasn’t enough to keep him going for 2 years.

eventually he ends up in mondstadt. weishi initially intends to remain only for a short while before he left on his quest again, but staying for one day turns into two days, then three, and before he knows it, he finds himself in the employ of the knights of favonius and looking for a place to live

While in mondstadt, he befriends a fellow knight named Tia, who, just like him, came from outside of mondstadt and settled there. She warmly welcomes him, even offering to let him stay with her. Her bright optimism is a sharp contrast to his quiet realism, but weishi finds her presence refreshing. He eventually becomes a captain in the knights (maybe city guard or something?), which tia supports. Life is quite good, and weishi quickly forgets about his quest for vengeance

But an oath sworn is not so easily forgotten. One night, while tia was out, weishi finds an opened letter addressed to her. At first he tells himself it’s rude to peek into what isn’t yours, but curiosity gets the better of him, and he takes a small look, just one.

What he discovers completely throws his life into jeopardy.

It turns out that Tia isn’t who she says she is - her real name is Anastasia, and she’d been an assassin prior to her coming to Mondstadt, apparently because she wanted to start over. Her first and last mission was - and this was what really turned Weishi’s blood cold - the killing of Weiai. His brother.

This whole time his brother’s killer had been his friend. What is he supposed to do now? He likes tia, he knows her kindness, he can recognize she has indeed changed, but she’d also killed Weiai, and he had sworn, promised, that he’d kill his murderer

Would he take tia’s life and fulfill his quest for vengeance? Or would he leave her alive - and defile his brother’s memory?

One day, tia invites weishi to patrol mondstadt’s lands with her, and he accepts, still brooding over his dilemma. The two go out further than usual, and soon it’s sunset. The entire time they are walking, weishi repeats the question over and over in his head: what should I do? What should I do?

It agonizes him to think about it, the thought of both his options pulling at his psyche. Weishi doesn’t know what choice to make, but he knows that he has to choose.

So he does, or rather, the choice is made for him.

He did swear an oath, after all.

When night falls, he returns to mondstadt saying that tia was gored to death by a boar, her body having been thrown over a cliff by the impact. When the knights recover her corpse, it’s hardly recognizable from the fall. But sure enough, there’s a large puncture wound in her gut, made by something driven deep into her. Weishi’s testimony lines up, and although he is questioned, there’s little reason to suspect he had a hand in her death.

The resulting guilt completely breaks weishi. He begins slacking off at work, unable to properly focus. Eventually, he resigns from the knights, takes his gear, and leaves mondstadt for good. At the moment he wanders liyue, doing odd jobs for whoever needs them