noun
happy ending junkie; stickler for happy endings
Internet slang for someone who strongly prefers or insists on happy endings in stories, often used in fan communities.
あの人はハピエン厨だから、悲しい結末の映画は絶対に観ない。
That person is a happy ending junkie, so they absolutely won't watch movies with sad endings.
ハピエン厨の私には、この小説のラストは耐えられなかった。
As a stickler for happy endings, I couldn't stand the ending of this novel.