You Can Become Stronger by Working Hard

What, time travel, it's still the same old plot, my father died in the war, my mother died of illness, my grandma and sister are the only ones left at home, and there are strong enemies outside? Damn, luckily I can become stronger as long as I work hard, take off, Sao Nian! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.