I think the young master is actually a very capable man if he choose to do so. His secretary doesn't even know that he is such a klutz before coming to the mansion. However, in the presence of Kishi-san, he decided to be all relaxed because he know that Kishi-san will take a very good care of him.
Why did jinwoo put a shadow soldier to follow hunter cha? She doesn't need to be protected since she is strong already. It's good to see he lose his cool, tho. Flustered and embarassed jinwoo is cute 😂