Mh, so since this misunderstanding has been cleared up:

Well, a common topic would be good for making friends, of course. If that didn't work out with the people you have been talking to so far, maybe you just have to try again :) People are different.

Also, don't forget that if people stop to message, that does not have to mean they don't like you. There can be many reasons and it does not have to be related to you at all.

In German, the normal way of talking anonymously on the internet is informal.

In Korean, the normal way of talking anonymously in the internet is formal.

This has led me in the weird situation where I was talking to someone formally in Korean and informally in German (and they to me).

As time went by, this started to bother me. Was I playing a role in one of them? And if I was, in which one?!

These differences are not just a change of the tone and attitude, they are the base definition of a relationship. The way you think is different. The topics you bring up are different, the questions you ask are different. After a while where I kept getting confused and kept questioning my words on both ends, I ended up behaving formal-like in German, too. The weird thing was that in order to achieve that, I started to call the other "Sie" in my head. Though I didn't dare to change the personal pronoun in words.

Maybe it would have worked to change that too, I don't know. It's just that going from informal to formal is one of the most brutal things you can do in German. I have the impression that this is not the case in Korean, so maybe the other might not even have been offended? But you never know. I would not have meant it in a mean way, quite the opposite! I don't even know why this is so hard in German. But it is.

Sprayers in my area at least have the decency to not damage historical places, at least I don't see that. So things are somewhat okay, I guess?

I find it terribly egoistic to spray one's name / tag on walls. It will disturb countless people - the more it gets, people might even feel down - and it has a meaning for only one. And there are so many people forced to see it so often. That can sometimes make me very angry.

Beautiful paintings on, for example, endless walls next to long streets can be a very different story. Those might brighten the day of many - or at least that is true for me and some who I have talked to. But I don't mean just those flashy names here, but real images. (Although these colourful names do get less on my nerves, I guess.)

It's forbidden either way of course, and will be cleaned in most cases.

There is a second hand book shop near my place where an amazing artwork covers one wall: a living book, surrounded by beautiful colour effects. It must have been done in agreement with the store. I love this wall.