
This site ripped from magus toon.
So here the chapter with high quality images.
Not so for the translation though, it's just mid, lol.
https://anisascans.in/manga/i-became-the-youngest-sister-in-law-of-the-male-leads-in-a-tragic-reverse-harem/

I'm either run, call security, or completely ignore it.
First there's no way I'm climbing those stairs, day or night doesn't matter.
Second, it simply suspicious. It's either connected to the case and it's dangerous man who could push you from the building, or other people who absolutely have no business in that building whatsoever, and TOTALLY DANGEROUS.

There's a differences between two works.
I'm quite shock to learn that in the novel, at this point he's still an elementary school student.
Because there'll be a transition when he graduated from elementary school and get into art junior high school. And his female friends (I forgot her name) goes into different school.
And it much more heartbreaking seeing an elementary school student being so considerate and sometimes even put himself down several times.
The novel is such an wholesome read when everyone tried to help him and he was broken so much that the process is heartbreaking.
But, after several breakdown and he hyperventilate in the middle of shooting, he finally get help he need for.

I have the link for decent translation, but the site is dripping with ads, so thread carefully.
https://manhwaclan.com/manga/that-villains-life-ill-live-it-once/chapter-53/
I think you guys are so hard on her.
She's doing all of this revenge for HIM. Because she LOVE him and GUILTY towards him.
It doesn't matter whether she's responsible for the past or not, SHE felt that.
So, of course everything about him going to made her falter. She's not a robot that programmed to be one thing only. She's a human being with a complex feeling.
The revenge is for him, not for herself. That's the reason why the resolve is different than other revenge story. The only mistake she did is underestimate Ianfried's cruelty.