How should one choose the research interest as an international student at current university?
You are not forced to stay in your undergraduate research area forever. It is quite common to change directions when entering the master's, and again when starting a PhD. So don't worry too much about picking for the long-term.

If you are a strong self-directed student who doesn't really need an advisor anyway, you could pick solely for the topic. I have known people like this, they knew what they wanted to work on exactly, so they picked a random topically proximal prof as a signature-generating machine and then they shut themselves up at home or went on an extended holiday, showing up with a completed project and thesis at the end.

But as it sounds from your description you care quite a lot about having a supportive environment and interacting with others in your group. As someone who is also more of that type, picking primarily for a good relationship with the advisor was a more successful strategy for me. Of course, you should at least be somewhat competent in the area and not completely disinterested in the topic either.