Me, Poor? My Junior Sister's Allowance Could Buy a City

[Dragon-and-phoenix leads + pretending to be weak while hiding their strength + poor senior brother + rich junior sister] My name is Yun Yin, and I'm the eldest disciple of the Qingfeng Sect. You might not believe this, but my master, Daoist Qingfeng, is an unparalleled expert with cultivation that reaches the heavens. Yet his parenting philosophy is “raise boys poor.” So while my junior sister Yue Yao wears a flowing dress woven from celestial silk and munches on a Redscale Fruit that bears fruit once every hundred years, I'm dressed in linen washed until it's faded white, squatting by a cliff with a furrowed brow as I wonder whether I can drink spring water with my fasting pill and make it taste like braised pork. Everyone thinks I'm a poor disciple my master doesn't care for, destined to amount to nothing. Only I know that my master sneaks into my shabby little room in the middle of the night and hands me the long-lost Taixu Sword Art, lost for a thousand years. As he furtively slips me the manual, he glares and whispers, “Hide it well! Don't let your junior sister see it, or she'll accuse me of playing favorites and not buying her a new dress!” That's right. The “lavish upbringing” of my junior sister, Yue Yao, is all for show. It's a display of affection meant for the whole world to see. My “poor upbringing,” on the other hand, is just for show too. It's a treasure hidden from the whole world. Our greatest joy as senior and junior disciples is pretending to be weak while hiding our true strength. She is the harmless-looking little pig who only knows how to throw money around, while I am the dowdy mud pig who keeps a low profile until I make my move. This story begins when I went down the mountain to buy soy sauce and ran into an arrogant immortal second-generation rich kid who insisted on taking the new dress my junior sister had just bought...