Notes:

at least 15-20% of the translation is just my own interpretation, because from what i see, there seems to be a lot of innuendos/euphemism, subtle or not so subtle. it's kinda hard for me to grasp since...well...dundundun...i'm innocent lil oldkid, lol. ok fine let's get to business.

• 끝=the end, 까지=till an extent...so 머릿속 끝까지 ...until the end of...head? but i'm thinking it could also refer to hair since yknow...so i choose the most vague/universal in between=all over my head, so it could refer to literal finger/all over head/hair OR it could refer to the mental impact of the electrifying fingers in his mind.
• 오늘을 끝까지=today+same phrase as above=until the end...so it can also be 'until the end of today'...but i think 'today all the way' kinda gives it more impact its probly implying?
• the line about 'lightning strike'...at first i thought it was 'struck by lightning'...but upon closer look at that line and the line afterwards...i think you can kinda...grasp what he's getting at...probly? idk...
• Revive, fill me up to the depths of your heart - this is rather hard for me to understand myself, i mean the Korean lyrics...so...i make it as vague as possible...haa. but if you really get into it, you can kinda make it out....i guess....
• i'm guessing the 'beyond the horizon' (yes with inverted comma) is probly...saying beneath/beyond the surface....and looking at the song context, it could probably mean metaphorically and/or literally..ha. and the 'You have wanted my sign like crazy'....well, i thought it could also be him who wanted his target like crazy since it's not mentioned about anyone else's desire but himself the whole song so that part is kinda odd,...but i'm sticking up with it because '내 sign'...내=my, and 너=you...so, i hope i didn't get that wrong...T^T...
• 본!능! - this could be two different words...but i'm suspecting it's stylized one word broken into two...which is 'instinct'. This is completely my own guess considering it's rap part and they always do weird/crazy/random stuffs during raps so yeah. the line that follow (I want you already in this moment, growing inside of me) well, this line also confused me to translate since it's so long...but i think the growing inside me is referring to his desire for the persona he's singing the words to, or...it could mean slightly different/you think abt it/
• There are probly more. I just can't remember all. Do ask for any confusion. Ugh, i kinda hate how i have to dirtified my mind just to try to really understand what he's getting at....judging you,ert lyricist,aren't you supposed to just learnt Korean language?.lol