Childhood Sweethearts' Scripts Always Lead to Romance [Quick Transmigration]

On the brink of death, Xi Jianwei bound himself to a "Childhood Friend" system, tasked with playing the role of the cannon fodder childhood friend in various small worlds. But for some reason, Xi Jianwei always manages to turn the childhood friend script into a romance route. 【World One: The Childhood Friend Script of the Adopted Son in a Wealthy Family】 Xi Jianwei was the adopted son until one day, the couple of the Xi family had their own biological child. He gained a "younger brother." At first, the younger brother wanted his care, then his hugs and affection, and finally, pointing to his lips, he said to Xi Jianwei: "I want a kiss." As his "older brother" and childhood friend, Xi J...