A Dad Has Arrived in This Quick Transmigration Story

[I'll proofread the whole thing when I have time, so don't be surprised if you see an update notice.] The Demon King Fei Ran gets thrown by his father into one world after another to play Dad, so he can experience for himself the misery of having troublesome brats. Fei Ran has no memories, but in every world, he's the father. Facing a bunch of lively little brats, Fei Ran raises an eyebrow. Kid, Dad's here. World One: A delinquent son and his laborer father. Fei Ran: Pay attention. Dad will teach you how to spar. World Two: A spoiled son and his proper father. Fei Ran: Kid, lend me some money. Watching his father stop working overtime and start eating, drinking, and neglecting his duties, the kid's heart trembles. It's over. I've corrupted my old man. Grandpa, don't hit him! World Three: A prince father worked to death and a heir-apparent son who will work himself to death someday. Fei Ran: Come on, Dad will teach you how to be a couch potato and coast through life. World Four: A rigid, traditional father and his gay son. Fei Ran: If you like him, you like him. Let's see who dares object. Other worlds to be decided... #Turn every quiet, desolate life around# #Stand tall and stride forward# Note: 1. I don't know your trigger points yet. I'll add warnings if any come up later. 2. The author has no preference for sons over daughters. So far, inspiration has only struck for everyday life with sons. (Head in hands, please don't roast me for only writing about sons. I'm just out of ideas for now, sob.) 3. Every story has a different focus and core. If I write a story about a daughter or a romance next time, it'll have a different feel. Please don't jump to conclusions, sweethearts. "What Can I Use to Save You, Bro? [Quick Transmigration]" "Big brother?" Xie Yu played with the razor blade in his hand, lifting his eyes toward the younger brother opposite him. The corner of his mouth curled in amusement. "I don't have a little brother like you." Xie Yu, who hates younger brothers most of all, gets bound to a System. His mission is to save those troublesome little brothers. Save them? Xie Yu rolls the word around in his mouth, then grins. World One: Xie Yu looks at his sobbing little brother. Xie Yu: You look good when you cry. World Two: Xie Yu looks at his gloomy, withdrawn little brother. Xie Yu: What do you think of the height of that building? World Three: Xie Yu looks at the little brother who envies him for being crown prince. Xie Yu: Tsk, I'll let you have it. World Four: Xie Yu looks at his impossibly kind little brother. Xie Mei: Keep being kind. Your big brother will always support you. In the end, The little brothers: Waaaah... Big brother, I'm sorry! System: ???! This is just... ridiculous! Theme: Stand tall and stride forward