MTL - Back To 2005 - Chapter 9 Crayfish also have dignity

Shen Zhixian transmigrated into a book as a cannon fodder master who hatefully severed his disciple’s spirit root. This disciple fell into the devil’s path and returned to make mincemeat out of him.

Shen Zhixian just happened to transmigrate into the last moment of the master’s captivity, and then he was reborn again.

After rebirth, he devoted himself to fostering and supporting his disciple, only to discover later that his disciple was also reborn.

Even worse, the disciple still retained the memory of his life before rebirth.

Shen Zhixian: …Disturbed.

Afterward, he realized one truth: Being a master is a high-risk occupation. Not trivial at all!

- Description from Novelupdates

The protagonist travels through Shu Mountain and becomes a demonic dragon guarding the heavenly book in Dinghu Peak.

Lugis is an adventurer who accompanies the Hero’s team party. However, every day he has to fulfill tasks that are not pleasant at all. In addition, he is oppressed by the other members of the group. The only reason he remains on this journey is because of his childhood friend, Ariane. But she is fascinated with the team leader known as Hero. One day a shadow figure appears and tell Lugis, “Let me give you a chance. A chance to redraw your life.” And so, Lugis is given the opportunity to be sent to the past to restart his life.

After 50 years of being in the position of Hwacheon Clan Leader, Kang-hyuk, widely renowned as 'The Dragon' retires.