There is a creepy scene in Black Mirror..
http://www.mangago.zone/read-manga/black_mirror/
It's something older than this one, but thank you
If it’s not one of these, they’re worth the read anyway and have similar elements that you’re after. (￣▽￣)╭
http://www.mangago.zone/read-manga/jou_sama_no_roommate/uu/jou_sama_no_roommate/
http://www.mangago.zone/read-manga/ouji_no_hakoniwa/
http://www.mangago.zone/read-manga/ano_ko_wa_sore_wo_gaman_dekinai/
http://www.mangago.zone/read-manga/hizumu_sankaku_hodokete_karamu/
http://www.mangago.zone/read-manga/lovers_in_1k_apartment/
http://www.mangago.zone/read-manga/call_my_name/
http://www.mangago.zone/read-manga/zenbu_ore_no_mono/
http://www.mangago.zone/read-manga/free_dj_trouble_makers/
http://www.mangago.zone/read-manga/romantic_bitch/
http://www.mangago.zone/read-manga/peeping_tom/
http://www.mangago.zone/read-manga/deichuu_no_hasu/
http://www.mangago.zone/read-manga/window_beyond_window/
http://www.mangago.zone/read-manga/1305/
Thank you, I will see
It was something like a guy was always watching his crush do you know what through a crack in the door. And then one day, one of them invited him in because he knew that he was watching all the time