Responses
I have not read it myself yet but maybe it's like what you wanted:
http://www.mangago.zone/read-manga/that_summer_kim_hyun/
Sorry to recommend something I've not even read(￣∇￣")
maybe this topic can help you:
https://www.mangaupdates.com/showtopic.php?tid=12352
Can someone please recommend me a romance manga in which the guy is gay or bi and a girl likes him