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I don’t understand, why the rest of human (doors) get miserable when they become doors and end up dying except for our MC?
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There are a number of reasons for that. Mainly the fact that (unlike Cain and Gyeong Joon) other demons use humans purely as doorways and don't actually form a relationship with them. The humans are basically in a constant state of terror and being a "door" interferes with their normal lives and relationships.
And aside from Cain being the way he is, Gyeong Joon had been living with the pain and loneliness since losing his fiancé. So he had a void that Cain was immediately able to fill, and gave him the opportunity to heal and fall in love again.
What! So Hakkai’s right eye is an artificial eye!
So what is the purpose of the glasses he uses then ?!