In the Qi Refining Stage, People Live for a Billion Years

[Urban Cultivation + Immortality + Miracle Doctor + Invincibility + Brainless Coolness] Refining Qi is the initial stage of cultivating immortality. However, Li Yu was trapped in this realm for a billion years, refining his Qi to the 100 millionth level. Twenty years ago, he desperately started his final attack on the foundation building period. As a result, he did not break through the foundation building stage, nor did he reach the level of 100 million and one levels of Qi refining. Instead, he returned to the first level of Qi refining. Only this time, the Qi he cultivated was not spiritual energy, but... Fairy spirit! After one level of Qi refining, will I become an immortal?