They're basically an INFP + INTJ pairing.
Who’s who?
Euiijoon is the INFP (or an INFJ), and AhJuicy is an INTJ. The latter makes the most sense to me because he shows his love through actions, is a man of few words, and he has fixed stoney expression on his face that doesn't show a lot of emotion.
They're basically an INFP + INTJ pairing.