The thing is... not every chapter has to advance the plot just for the sake of advancing the plot. You need background and context for the characters in order to be able to understand their mindset and actions. Otherwise then the complaints would be about the characters being bland or the story not making any sense.
Same thing happened when Young-Woong was introduced, people was "Who's this dude?" "Who cares about him". Then when he fought against Maria the comments were "Oh, that's why he didn't want to help MC" "Oh that's why he was beating up bullies in middle school".
If you just care about the plot moving forward then I suggest waiting for the series to be completed so you can binge read it and not worry about these type of chapters.
And for the people that just want to see the MC... Well, you have Solo Leveling lol.