So Yeonjun has TWO heart-shaped birthmarks, one on his lower tummy and one on his hip, and I don't think I've read a fic where the bg is absolutely obsessed with them—because he WOULD be. Like, the first time he discovers them, his eyes go dark and he mouth waters and...well let's say hearts are meant to be red, but the tiny one on Yeonjun’s hip has turned purple under his mouth.