Hydrogen peroxide solution, with the chemical formula H₂O₂, is commonly known as "double oxygen water" in its aqueous form. It appears as a colorless, transparent liquid, indistinguishable from water. Upon heating or with the addition of a catalyst, it reacts vigorously. Su Yiting, a female teacher as clear and pure as water, lives a life as ordinary as water—until she meets an exasperating yet unforgettable student, Yu Keyou, and everything seems to ripple... Yu Keyou, a seemingly innocent but mischievous young girl, firmly believes in one truth: every naive soul in this life was a wing-clipped angel in their past life, and God has assigned each of them a gentle and charming "older sister" figure. But when she encounters chemistry teacher Su Yiting, she begins to doubt this rule... This story follows a lighthearted and comedic tone, slow-burning with some tropes, naivety, humor... and perhaps a touch of sadness, but joy is the ultimate goal. A tale half-true, half-fictional—written as both a tribute and self-indulgence. Reader group for Xiaocai: 57456187. Knock and call out "Uncle Cai." This story went VIP on March 8th, Women's Day—pfft, a Friday. Chapters 41-75 are inverted VIP content; readers who've already seen them, please don’t repurchase. Xiaocai will update three times that day as thanks for everyone’s support, promising diligence and no abandoned pits. Given the effort poured into writing, please be merciful with reposts and piracy~ Xiaocai bows to you. A tangled tale: This is a sweet new story!!!