There's an entire ark spent praising a parental child abuser , actively belittling parental child abuse victims, and blaming/shaming the victims of parental abuse.
It starts out a fun kids comedy manhwa, though really hamfisted in it's approach to teaching it's message; that certain prejudices/morals/behaviors are good/bad each ark, it disperses the rants enough that it's easy to ignore the very shortsighted hypocrisy involved in most of them. But, there comes a point where the way they go about teaching their message the manga is trying to preach is just too disgusting to ignore.
Honestly, it's such an addictive comedy story up to that point that I probably won't drop it in-spite of this, since it's just that compelling after a certain point, it's just that I can't give a rating better than this to a "kids' comedy manhwa" that did what this story did with the pyramid/tetris ark. (Edit: it goes back to being a really good comedy story for kids after that ark, but my rating will be left unchanged due to the how the pyramid/tetris ark was handled)
I also take issue with the some of the messages in that ark(Examples: If you do something for someone else's sake not just your own than you don't really care, and unless you make a decision without taking anyone else into consideration you didn't make the decision the other person did, even if the other person is a baby<-- seriously!) the way the story handled the abuse was just the aspect that went too far.
NOTE: author "doesn't promote child abuse" they just handle that topic so badly that they may as well be, same goes for the other two topics. Here's an Example: (The story states that the really horrendous stuff done such as trying to murder the child and their spouse when they grew up, since they decided to live their own life instead of living the life the parent was trying to force on them, and trying to take the couple's child by force in order to try to force the life that the child rejected onto the grandchild under the same abusive circumstances is love, and that the child should value forgiving and making up with the parent over the life of their spouse(the only one that seemed to care about the child), because they are family, even though the parent's attempt to kill the child is what ended up indirectly leading to the death of the child's spouse. The parent on their death bed after finding out that the child had eventually managed to accomplish what they wanted, and realizing that they'd never truly cared about their child until that point denied that they truly deserved to be forgiven at that point they'd accept reconciling if the child wanted to, but they wouldn't try to force reconciliation like the person comforting them was trying to convince them to do. (oh, right the person that supported the child abuser on their death bed is someone akin to the benevolent/god of the manhwa's world, they apparently supported the abuser since in their eyes they abused for the sake of love towards their child, and later states, that had the child truly come to hate people and as a result tried to isolate themself in order to avoid harming or influencing other's badly, the god would've killed the child, the only reason they accepted the child isolating themself was because the child didn't truly hate people.))