It would be nice to be able to respond to specific comments, as seen in WhatsApp, Slack, Facebook Messenger, Line, etc…
Hi @BaiJie 
Thank you for suggesting it to us, actually this is already on our roadmap and it’s currently in our planning stage.
I would encourage you to go and vote for it as it will increase its importance.
It will basically allow you to respond to a comment and create a thread out of it, just like on facebook (or at least similar to that).
Cheers 