Mysteries of Immortal Puppet Master - Chapter 572 - 154: Thief! This is a thief!

When The Cute Kunoichis Spied on Their Teacher's Secret is a light novel written by Kazuma Kamachi and illustrated by Ryuushi Tajima.

The story takes place in a world where Japan never ended their isolationist phase, and agents from foreign powers are always threatening to steal the country's advanced technology. In order to combat this threat there has been a resurgence of ninjas that use Strategic Martial Arts, techniques that combine cutting-edge modern technology with a traditional foundation of martial arts and ninjutsu. The story follows Souha Sugiyado, a 17-year old ninja instructor and former ninja prodigy who was forced to retire from active duty by the wounds he suffered in his last mission. Souha's four students are all kunoichi who have all gained the rank of Elite Ninja, the highest official rank available to ninja. However, one day two Shogunate ninja approach him with the news that his four students have gone rogue and have stolen a portable modular nuclear reactor, and thus they ask for his help in bringing his students to justice.

Tu Xiao'an dies due to an accident and he is luckily reborn as a snake with a system. As long as he gobbles down some preys, he could speed up his course of evolution and gain more power to protect his family.'Mom, Sis, I'm sorry. I'm so, so sorry for making you grieve!''One day, I'll stand before you again, out in the open, and take care of you!'

Liu Ming, since he was young, lived in a savage prison named Savage Island where the prisoners aren’t controlled by any guard or security. When the island sinks due to “mysterious” events, only a handful of people survive – those survivors are then pursued by the government.

On the other hand at another place two practitioners are worrying about what will happen to them because the young master that they were supposed to protect had died.

Their young master looks nearly like our MC
What will happen?

- Description from Novelupdates

Year one of the New Era, the Demon King was defeated by the Hero, divided into thirteen parts, and sealed all over the world. Only the soul can reincarnate and be reborn.Year sixteen of the New Era, in the tavern of a small town on the border, a young maid named Mohe sees a middle-aged man who only brags to deceive people for drinking money. However, she knows better than anyone that he was the Hero who defeated her and split her into thirteen parts.“The former Demon King is now wearing maid clothes and working as a server here?”“The great Hero sir, instead of being affectionate with your harem group, you bark here like a stray dog, deceiving for food and drink. How is that different from a beggar?”