He regularly works out to keep in shape and his diet is very self-disciplined

An anonymous staff told that:

I have worked with Li Xian for more than a year. When I joined the company, I heard that he regularly works out to keep in shape and his diet is very self-disciplined. I thought he was the kind of boy who didn’t like sweets and snacks by nature. Then I discovered that it's not true at all! Sometimes the staff holds milk tea, he would look at it with admiration, and then silently swallow two mouthfuls of water.