what’s good 怎麼回？

Here are some responses you can use:

1. Fantastic! 很棒呢
2. Pretty good. 很不錯喔
3. Not too shabby. 還算不錯
4. Not much going on. 沒什麼特別的啊
5. It's okay. / Just the usual. 還挺好 / 照常吧
6. Same old stuff. 老樣子了