오롯이, orosi: wholly, with nothing kept back and nothing left out. 그 마음을 오롯이 담았다 — he put the whole of what he felt into it.
It is an adverb, so it never stands on its own. It fixes itself to whatever you are doing and says that you are doing only that.
Which is why it has quietly got harder to use. We eat and look at a phone. We listen and think about something else at the same time. Very little now gets the whole of anybody.
The tea went cold twice this afternoon while I was answering things.