Spoilers ahead...
Firstly, I definitely think they killed themselves at the end. The movie that they watched in one of the earlier chapters where the family killed themselves after eating those poison berries was most likely meant as a foreshadowing and the image of them being happy at the beach is what I presume to be the imagination of the grandmother, who hopes they are happy and having fun somewhere else. Secondly, even though there were plot holes like who actually killed the woman or was Gusam actually guilty, I feel like it made sense that the author left that out since they probably would've never been able to find the real suspect since technology wasn't as advanced back then. Also the ending left me heartbroken but it made sense to me because what else could have they done? They were both murder suspects in the end and had nowhere to go. I'm literally still ugly crying and just wanted to get some stuff off my chest about this beautiful manhwa. 10/10 worth reading for a good cry.
Rec me some good shounen ai mangas/manhwas/webtoons (づ ̄ ³ ̄)づ. I don't really like reading yaois cos too much sex kinda ruins the story lol. #-.-)
Since your BL archive contains mostly of manhwa, i'll recommend you some manga now :
http://www.mangago.zone/read-manga/kasa_no_shita_futari/
http://www.mangago.zone/read-manga/hana_no_mizo_shiru/
http://www.mangago.zone/read-manga/slow_starter_ichikawa_kei/
http://www.mangago.zone/read-manga/papa_is_a_bride/
http://www.mangago.zone/read-manga/haikei_niisan_sama/
http://www.mangago.zone/read-manga/number_call/
http://www.mangago.zone/read-manga/senpai/
http://www.mangago.zone/read-manga/links/
http://www.mangago.zone/read-manga/colorful_line/
http://www.mangago.zone/read-manga/paradise_view/
http://www.mangago.zone/read-manga/koori_ga_tokeru_no_o_matteru/
http://www.mangago.zone/read-manga/lonely_to_organdy/
http://www.mangago.zone/read-manga/never_understand/?av=2
Hello, idk if you read them
http://www.mangago.zone/read-manga/hollow_lovers/
http://www.mangago.zone/read-manga/fools/
http://www.mangago.zone/read-manga/11_59/
If you want other shounen-ai, don't hesitate ^^
thanks i hate it