what’s good 怎麼回？

Here's how you can respond:

1. Awesome. 太酷了！
2. Pretty good. 還不錯哦!
3. Fair enough. 還可以啊。
4. Not much happening. 沒什麼特別的。
5. It's okay. 還行吧。
6. Same as usual. 老樣子。