Suffer and Become Stronger

After traveling through time, Jiang Lang obtained a system called "Suffering is Blessing" and became a bookstore owner in this extraordinary world called Aquamarine. The system told him that as long as he suffered a loss, he could exchange for various awesome items! This is the rhythm of becoming stronger by suffering a loss! It may be difficult to make money, but to suffer a loss? Hey hey hey! But… "Uncle, this book is on special sale recently, take it away at 10% off!" "Xiao Jiang, I accept your kindness, but I can't let you suffer, right? You should take this hundred yuan!" Jiang Lang held a hundred-dollar bill in his hand and looked at the sky speechlessly. "I... I just want to suffer a loss!!"