Litrpg: Start from Invincibility System

The Heavenly God Continent was incredibly large and far-reaching. There was an abundant amount of spiritual energy which was critical to all Spiritual Cultivators. Humans and demons resided on the continent but have been at odds for many generations and the conflict doesn’t seem to be slowing down.
Lee Yiran was a young nobleman who lost his mother in his early years. His father married his new sweetheart who he heavily doted on. The problem was that she didn’t have a good relationship with Lee Yiran and it kept getting worse as time went on. That made Lee Yiran decide to run away from home and join the army. But within a few days of being there, his body was taken over by a transmigrator. The process brought miraculous changes by filling him with an endless amount of spirit energy which made him an invincible cultivator. But the heavens will not tolerate the existence of an invincible being. So he was forced to hide his strength and return to his old home five years later.