Is it okay to wear a suit and bean shoes?

What style is this suit? If it is a Korean style, it can be paired with dark bean shoes. If it's European, it's best to match leather shoes. Short suits are also popular recently, and the pants on the lower body are cropped pants, which look good with bean shoes.

As for the banquet, you should see if your fiancee is also a combination of tradition and fashion. If it's a traditional wedding reception, it's better to suggest that you behave appropriately.

Thank you.