This is the 13367th most frequent Korean word.
따뜻함을
"Warmth."
Here '따뜻함을' refers to the emotional or interpersonal warmth exhibited by '그', or 'him'.
그의 따뜻함을 느낄 수 있었어요.
I could feel his warmth.
In this sentence, '따뜻함을' denotes the physical warmth or heat present in the coffee.
따뜻함을 지니고 있는 커피는 아침에 참 좋습니다.
Coffee that holds warmth is very good in the morning.
In this case, '따뜻함을' symbolizes the emotional or literary warmth the book aims to deliver to readers.