
This might end up in a bittersweet ending or not.

Spoiler
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Read the 1st page of ch 1.You can see Theo on a bike sitting behind Os.He also states something about the expression on his family members,that he hears his childhood friend's wrenching sob for the 1st time(you can see Danny literally stooping).Basically this scene is that of the ending where Theo kisses Os infront of everyone and decides to leave his home forever making everone sad especially Danny.
So,what I actually said is that the story actually starts with how it ends i.e them leaving but the whole manga is kind of a flashback as to what events led them to meet,fall in love and leave ch 1 http://www.mangago.zone/read-manga/rumspringa_no_joukei/hs/mpn_chapter-1950923/5/
The ending
http://www.mangago.zone/read-manga/rumspringa_no_joukei/raw/tr_chapter-0.1/pg-221/
http://www.mangago.zone/read-manga/rumspringa_no_joukei/raw/tr_chapter-0.1/pg-222/

I'm quite suprise of myself for finish reading it. It always leaves a bad taste in my mouth since the first chapter until the end.. (maybe I should have said the whole story was too twisted )
There is 2 things I would like as an ending to this story: (1) Kyungsoo would end up with Dong Hyuk and Yul will be killed, dir and/or sent to the mental hospital; and (2) Kyungsoo still ends up with Yul and they slowly develop. (I guess)
The story is so dark, twisted and Yul's siblings are all 'Psychos'. I won't be reading this again unless the author would add more chapters to compensate. but I can never forgive the rape thing, I can't stomach it.
Such supportive parents. So supportive they'll give him condoms and energy drinks