Invincibility Starts from Eating Grass

Invincible + system flow + single female protagonist + funny. On his way to get off work, Gu Han was ganked by a female driver and accidentally traveled to Lingtian Continent. Unexpectedly, he discovered that his lifespan was short as soon as he traveled through time. Fortunately, he accidentally awakened the system. As long as he swallowed weeds, he could increase his lifespan and attributes. In order to survive, Gu Han had no choice but to devour the weeds. Many years later, Gu Han finally grew up enough to fight against the existence of heaven, and finally understood why he could increase his lifespan by swallowing weeds.