Happy Doomsday

Genius scientist, Ruan Xian, was in a coma for several years. Once he opened his eyes, his waist no longer felt pain, his legs had healed, and he could jump around. Unfortunately, the artificial intelligence outside ran out of control and ushered in the end of mankind. Fortunately, his luck was still strong and he successfully captured a partner with great survival skills. Source: NU Includes 3 extra chapters.