I thought it was bronze, but I didn’t expect it to be a king. What does it mean?

I thought I was a bronze, but I didn’t expect to be a king. This sentence means to describe a person who originally thought he was not very good, but unexpectedly found out that he was actually very powerful, hidden deep inside! Bronze and King are both ranks in the game "Honor of Kings". Bronze is the lowest rank and the best at playing the game; while King is the highest rank in the game and is also the most powerful character in the game. So, putting these two words together creates a strong contrast. Bronze King is now often used to describe a person online. We often see videos in which he seems to be very powerful when he first appears, and everyone thinks he is a king. Unexpectedly, he turns out to be very weak or very cowardly in the end. At this time, everyone will describe him as a bronze. On the contrary, if the first impression is that it is not good, but in the end it surprises people and makes people feel that it is great, this is often described as "I thought it was a bronze but I didn't expect it to be a king" to describe such a situation.