The story of how he became a top swordmaster through hard work after his rebirth.

The main character was called Xu Han. In his previous life, he was only at level 4 of the Barbarian Realm. His sword soul was a very short sword and was called trash by others. Later, he challenged his cousin Xu Hai and was killed by Xu Hai. Then, a person from another world somehow entered his body. No one else knew his true identity. Then, the person who replaced Xu Han found that Xu Han's sword soul had turned into the thunder sword that he used in his previous life. It's probably the beginning of the book