Responses
I think this is it
http://www.mangago.me/read-manga/july_found_by_chance/?S8IP
it's july by chance! here u go http://www.mangago.me/read-manga/july_found_by_chance/?jPRg
It is shoujo manwha ... the world was inside a manwha , mc was side character in that.she had a heart disease, also had a fiancee, and ml's name was maybe haru....