왠지 사심이 들어간 것 같기도
= (lit.) For some reason, it seems there is selfish intention in it.
= Somehow, it appears to have ulterior motive.
(It doesn't say what "it" is, but it could be a remark, decision, etc.)
* 사심 = personal/selfish intention (사 = private/personal, 심 = mind/thought/intention)