Jin
He loves all things cute or related to hearts, so he would just fall for you right then and there when he seems you have a birthmark shaped like a heart.
Suga
On lazy days, he would trace it with his thumb and smile at you. He’d think of you as his angel of love and will never let you go.
Rap monster
he would be very inspired my your mark. He would even put in a small line about it in one of his love songs.
J hope
“I’m your hope, I’m your angel, but you are my love.”
“I love you too, Hobi~”
Jimin
He’d get all excited when he sees it. He wouldn’t be able to help but stare at it and turning into a giggling child again.
V
He would see you as a goddess. He’d be completely amazed by your mark.
“My birthmarks just looks like a big dot…”
Jungkook
He’d blush the first time he saw it, not just because it’s a heart, but because he knows he’s the only one who will see it. He’d want you to hide it from everyone else.