Playing Savior in an Infinite World

Xiang Yang was a genius doctor who saved the world. After working himself to death, he was bound to a quick transmigration System. Before entering the System: I only need to save my kind, gentle, pitiful little brother to complete my mission with ease and gain freedom for the rest of my life! After entering the System: The apocalypse arrives, social order collapses, human civilization is destroyed, disasters and calamities abound, and monsters and ghosts roam everywhere. Wow, look, little brother's about to die! Xiang Yang: "...I never thought I'd run into a heartless capitalist even in a quick transmigration System!" The quick transmigration System's mission, Save Your Little Brother, is forced to change its name to Dr. Xiang's Journey to Save the World. The all-purpose Dr. Xiang VS all kinds of quick transmigration worlds on the brink of collapse World One: The whole planet has become an interstellar amusement park, and surviving humans are forced to make a living through livestreaming. Are they all doomed to die in the "livestreaming arena"? Use high-tech and good looks to defeat the interstellar invaders. In the fields of brains and beauty, no one can beat Dr. Xiang. World Two: In a cyberpunk world, order collapses and everyone worships the "Prosthetics Cult." Will replacing your limbs grant eternal life? Use fantastical martial arts and theoretical knowledge to defeat AI androids. In the fields of fantasy and reality, no one can beat Dr. Xiang. ...To be continued Theme: As long as humanity stands united, the world will be invincible