@heaven official gay lian if i remember correctly, it was about the MC's criteria to dating the vampire guy. he had to finish high school, go to military service and date someone (specifically a guy). After all those, the MC will "think about" dating vampire guy
All trope are good if you do them right.
ex : Love Triangle, but...
A loves B,
B loves C,
C loves A.
ex : Love Triangle, but...
A loves B,
B loves C,
C loves A.