I'm having this huge mind blank, can someone help me remember this Kdrama??? I don't even recall who starred in it or if any EXO members had roles. A character worked at a construction site or something and always neglected to wear his hard hat. One day his manager/director/someone scolded him and gave him his own hard hat. Something caused the building to collapse and the hard hat saved that one guy's life. Then there was a man (I can't remember which character this was) who ended up impaled on a steel beam or something, and he was still alive. Another guy (the manager?? the guy who forgot his hard hat??? I can't remember) was trapped with him and couldn't move to help him and had to listen to him slowly die... The company tried to cover up the incident even though it was their fault, and I think that's why one of the main characters was after them - he wanted to expose the truth. I really want to rewatch this drama, any help is appreciated!