Genshin Impact: Knife Wendy's Friend at the Beginning

[Time Travel + System + Male Protagonist + Friendship Direction + No Female Protagonist + Self-written Vague Plot + Genshin Impact + Possible OOC + 10086] (I'm writing this as a fan, so please let me) As an outstanding employee of the Traveler Studio, Su Chenfan is conscientious and conscientious. One day, he received a mission about the continent of Teyvat. It was said that he was asked to correct the necessary plot. In human terms, let him make the knife that will definitely appear. So, in chronological order, Wendy's friend became the first victim. Su Chenfan stood on the high tower, wearing a black cloak. In the wave of people's resistance, when the once tyrannical king was about to be overthrown, he shot this arrow into the heart of Wendy's friend. "If you're going to resent me, then resent me, Wendy." And you, my friend. We use each other to overthrow the old dynasty. The first rule of the time traveler is to follow the tasks given by the system, no matter the ending is sad or happy. (This is my first time writing here, so try not to be OOC, maybe...?)