Is Yun male or female? In Only Sense Online, the main character is male, but in game people keep mistaking him for being female. 

Did the game actually turn him into a female character, or did he just get his features made more feminine?

This was the explanation from the LN, but it doesn't actually state whether or not the avatar was skewed towards being feminine or it was actually a female body: 


   When you don’t modify your body after your figure is captured by camera, an automatic body correction is applied. Mainly it works in the direction of adding femininity.
The game changed him into a female character because he didn't modify his body when setting it up. The game automatically added a body correction. It's near the beginning of Chapter 1 if you want to find it.