This is the 16690th most frequent Korean word.
사이부터
"사이부터" is not a standard Korean word or phrase. It may be a typo or misinterpretation.
Here '사이부터' refers to the point within their relationship timeline where the issues initiated.
그들은 사이부터 틀어지기 시작했다.
They began to fall apart from their relationship onward.
'사이부터' in this context indicates focusing on the aspects surrounding friendships.
친구 사이부터 신중할 필요가 있다.
When it comes to friendships, caution is necessary.
Here, '사이부터' specifies the relational starting point of growing apart.