三 Trigonometric Functions 三角函数 by Yu Tianyun (余添赟) StatusOngoingChapters1GenreDanmei (BL)EraModern EraSourceJJWXC Request a translation Stats 1Favorites27Nutrition Tags ThemeLovePOVUnspecifiedAge18+Destined PairingHappy EndingLighthearted Synopsis Cos0=1 Keep an idea Intention: Intention to be added Show more More by this author 调 Bartender Yu Tianyun k Killer Yu Tianyun 年 Young Yu Tianyun 灯 Dim Lights Yu Tianyun