Honestly I don't understand why it's rated so low and the people who rate it so low complain that it's too rushed :o in my opinion it wasn't rushed it was a great ending my negatives is the first few chapters scanning is not the greatest and it's more of a shounen ai than a yaoi but apart from that it's good ;)
I made a list of office webtoons if you are looking for more to read http://www.mangago.zone/home/mangalist/788879/
I'm disappointed the story changes to his sister's story I want to see them create a family together :'(