I was Caught up in a Hero Summoning, but that World is at Peace (WN) - Chapter 31: Sightseeing For Some Reason

Gradually, he found that he couldn’t leave this adorable kid, as well as his beautiful and stubborn mother.

Xia Xingcheng was about to get engaged to her childhood sweetheart, but her vicious half-sister, the daughter of her stepmother, set a trap for her out of jealousy. After a nightmarish night, her fiancé thought that she had cheated and canceled the engagement. Heartbroken, she chose to go abroad alone for a living.

Five years later, when her father threatened her with her grandmother’s health and forced her to return to attend her sister’s wedding, she had to come back with her four-year-old son. Although the child had been accidentally conceived, he was the only comfort during struggling to survive abroad. Coincidentally, they had run into the child’s father, Mr. Sheng, on the plane. But neither she nor he was able to recognize the other. However, perhaps blood ties were that mysterious, the kid sensed that this handsome and powerful man was his father! Although she had never thought of looking for the child’s father, fate had arranged for him to appear whenever she was about to be harmed by her shameless family. Gradually, he found that he couldn’t leave this adorable kid, as well as his beautiful and stubborn mother.

Synopsis ___________________ Viretta Medlit is a hopeless braggart. One day, she casually boasts to a young man she meets about her unfortunate arranged marriage, only to discover that he is her fiancé. To make matters worse, her exaggerated claims stir something within him. “Are you prepared to face any hardship?” “Of course. If it's for the one I love, I’d even hunt a dragon!” “Then let’s go hunt a dragon. And break off the engagement afterward.” Thus begins Viretta's journey to hunt a dragon… All in the name of breaking off her engagement with a fiancé she actually finds quite agreeable!

In this world, orphans or just anyone without any hope for this world can apply to become a “walking target”. Their sole purpose is to be a practicing dummy for the students of the sect who train to become “Demon Hunters”. These students need “walking targets” to test their training on living, walking beings of flesh and blood.
In exchange, they will be provided with food & shelter.
Their existence value is lower than a slave, but if they manage to survive a few years they can receive a life long pension.

Xiao Han is such a “walking target”. One time he witnessed a powerful Demon Hunter disposing a demon. When the demon died, a fragment of the demon that managed to escape entered Xiao Han’s heart. No one saw that, and even Xiao Han himself only felt some discomfort for an instant.

But that thing in his heart soon gave Xiao Han visions, and the first one is of a cultivation method which allows Xiao Han to absorb damage to enhance his body. A perfect cultivation method for a “walking target”.

- Description from Novelupdates