Male lead hides his skills from everyone

The male lead is smart or is good at something but he hides it.

many thanks for considering my request.

The Rise of Phoenixes (2018): It's a C-Drama and the ML does exactly what you ask for.

*I saw you dropped it, but I still write it down because others can like it instead; I personally loved it.

Healer (2014): K-drama (Once again, I saw you have this already in your list, so it's not helpful for you, but it can be for others)

Mr. & Mrs. Chen (2023): It's a C-Drama. They both pretend to be a little "dumb" about things, because they need to hide they're both spies