Blood Sweat & Tears Lyrics
My last dance
Take it away
My blood, sweat and tears
My cold breath
Take it away
My blood, sweat and tears
Even my blood, sweat and tears
Even my body, heart and soul
I know that it’s all yours
This is a spell that’ll punish me
Sweeter than sweet
Chocolate cheeks
And chocolate wings
But your wings are wings of the devil
In front of your sweet is bitter bitter
Hurry and choke me
So I can’t hurt any more
Baby, I don’t care if I get drunk, I’ll drink you in now
Your whiskey, deep into my throat
My last dance
Take it away
My blood, sweat and tears
My cold breath
Take it away
I want you a lot, a lot, a lot
I want you a lot, a lot, a lot
I want you a lot, a lot, a lot
So I can’t run away
Grab me tightly and shake me
So I can’t snap out of it
Kiss me on the lips lips,
Our own little secret
I wanna be addicted to your prison
So I can’t serve anyone that’s not you
Even though I know, I drink the poisonous Holy Grail
My last dance
Take it away
My blood, sweat and tears
My cold breath
Take it away
I want you a lot, a lot, a lot
I want you a lot, a lot, a lot
I want you a lot, a lot, a lot
Close my eyes with your touch
I can’t even reject you anyway
I can’t run away anymore
You’re too sweet, too sweet
Because you’re too sweet
My blood, sweat and tears

The phrase itself "blood, sweat & tears" is a form of expression that refers to grueling work that is put into something in order to acquire a degree of success (well, that is the aim - this doesn't necessarily happen).
Often, whilst visually pairing the music video with the song, my mind strays to The Seven Deadly Sins - a group of vices in regards to Christianity teachings - which is honestly quite perfect considering that BTS is made up of seven members.
The sins are as following; wrath, sloth, greed, vanity, gluttony, envy and lust.
Looking at the song's lyrics, and the members singing about their yearning for their object of affection - I believe Blood Sweat & Tears represents lust, or more specifically, an unrequited desire.
All members sing about a 'girl' of whom they have fallen victim to, in terms of obsession and compulsive, perverted thoughts.
Throughout the course of the song, they use breathy and honeyed voices - embodying the toll this deadly infatuation has taken on them.
The girl is a curse bestowed upon them - she is a villain. They refer to her as a devil - a hellish, sinful creature. Unable to quieten or silence their temptation, thus, it becomes a lethal inner manifestation.
So far so, that they are willing to renounce everything just for the girl's affections.