Scaramouche, he's your childhood friend, but, you had to move out and live to other place and had to leave Scaramouche. After 4 years, you came back and live there again. Now, you're a new student of the Teyvat High, as you were introducing yourself, you saw Scaramouche, he looks the same but adult version, of course. He became more handsome than before. But, he doesn't remember you anymore after all that years.