I'm Really Going to Become an Immortal

After a seven-day slumber, Chen Yun discovers that his body is undergoing inexplicable metamorphoses that cannot be explained by science. Evolving flesh, unimaginable abilities, mystical secrets... All his previous pursuits now seem trivial, including money and career. The existence of a mythical realm in fantasy also doesn't seem too far off. — Description from novelcodex.org