wait guys it gets better.
SPOILERRRR
the ml will learn that mc is resistant to his poison, so he will typically keep his gas mask off in front of him afterwards. rn tho ml think mc weak and might die so he try to protect him from posion. it happens a little later in the novel tho so PATIENCE IS VIRTUE AND THEN WE CAN SEE HIS FACE YAY!
According to Cha EuiChae in one of his comments he said that it is Lee SaYoung's "concept". Meaning it's for looks only. He takes it off when he eats. He doesn't have it on at the office. Etc. While the gloves yes. I don't think he breathes poison, only things that he touches. Although he can prob generate poison gas after he releases them. Like when he eats at the restaurant he touches the utensils and the bowls so those have to be discarded. But interactions wise he's speaking and breathing next to people and nobody got poisoned.
Not sure who posted this but this once seems to work. I had signed stored this one in my notes:
https://mentoltrans.wordpress.com/episode-1-prologue/
somebody PLEASE tell me the novel is better because i can't take this guy and his goofy ass mask seriously