I made an account just for this drama. The ending really made no sense to me. His ghost wandered around for a year, and now he has the ability to touch people and more importantly, people can see, hear, and touch him. He is basically like a normal human. And he has no repercussions for being able to act like a human. It really feels like the writer tried desperately to make a "happy ending" even with a "sad ending". Until the very end, I see no link with the Ministry of science/technology/whatever it was.