@Estrelli
TL;DR: Jesus fucking christ only now I noticed how long my comment is...here is the summary: Both are in the wrong, but I do believe the MC has more justification in the way he acted, he just had a rough day learning about Yurival's life and that someone is toying with him.
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Yeah, he is also stupid for just storming in, but we also have to put ourselves in his shoes:
1. He just got out of the mission, taking a look at both Yurival's repeating nightmare, and finally his dream come true.
2. Told by Ms. Bitch that the reason as to why his life and family has been met with misfortune after misfortune is because someone has been literally toying with his life.
3. And finally, after he can see the light the darkness, which is the money he is making to help his family and the opportunity to blow away the misfortune that has been plaguing his whole life, one of the people who ruined his life appeared out of nowhere in front of his house, and the cherry on top, this person told him he saw his sister working as a hostess (which in my personal opinion, is just at the end of the line reaching almost the job of a prostitute)
Of course he is going to be pissed.
Besides, saying "she is an adult, she can make her own life decisions" is just plain stupid, if life was that easy then no one would have to go through hardships...even grown ups can be more stupid than adolescents. Everyone, regardless of age, needs help in one way or the other....and even if at the end of the day the final decision is their own, that doesn't mean they can't take advice from others.
She just decided to start working as a hostess without even consulting about it with others. Well, is a job that you wouldn't really like to discuss about because of embarrassment, but is like saying that someone doesn't want to buy condoms at a store because they feel shameful about or someone who doesn't wanna to visit a doctor because they are embarrassed about the problem/disease/infection they have (Yeah, there are probably better examples out there but these are only ones I could think of the top of my head).
One wrong step and her life could be completely ruined, more than already is.
Although I do believe it is a too much to just call her a bitch. We have to also put ourselves in her shoes
Her family is beyond broken:
1. The brother's best friend betrayed him, leaving in debt, and besides this brother for some reason is unable to get a job even if he wants with all his hearth (we already learned the reason as to why)
2. Her mother is in a comatose state, so besides the debt of her brother they also have to worry about the medical bills for the mother.
3. The father is completely broken, just a shell living, who drowns himself in alcohol and has temper tantrums, destroying things around the house.
She is just desperate.