When is it important for people not to show their feelings?

I'd say there are certain professional situations where showing emotions can be counterproductive. The main reason is that strong emotional reactions might cloud judgment or damage working relationships. For example, in my UI design work, when receiving critical feedback from clients, I've learned to stay composed even if I disagree - because reacting emotionally could make them doubt my professionalism. That said, it's not about suppressing feelings completely, but rather choosing the right moment to express them constructively. In Shanghai's fast-paced work environment, this balance is especially important for maintaining effective collaboration.