Lie Flat: My Junior Sister Trains, and I Get Stronger

Su Yan is the senior disciple of Yunying Peak in the Taiyan Sect. He joined the mountain at five, and at eighteen he still hasn't opened his spiritual meridians. The sect considers him a hopeless good-for-nothing. He doesn't bother to argue. He grows medicinal herbs, soaks up the sun, and flips through the Compendium of Materia Medica. Life is pretty good. Then the Jiang family's genius junior sister, blessed with an Ice Heavenly Spirit Root, chooses him in front of everyone as her guardian senior brother. That day, a sweet little-girl voice rings in his head: "Binding Cashback System. Startup successful!" When the person he's bound to cultivates, he gets cultivation in return. When he gives something away, he gets back a higher-tier version. The more people he binds, the higher the multiplier. And so, his junior sister reaches the fourth level of Qi Refining overnight while he sleeps his way to the second. She trains bitterly until she reaches the ninth level of Qi Refining, while he lazes his way up to the tenth level of Foundation Establishment. He can only say one thing: Junior Sister, you're working so hard that you're making things difficult for your senior brother.