Jaehyun:
-Physical touch (You've seen how he is with Woonhak...)Sungho:
-Words of affirmation
-Acts of service (I couldn't pick between the two Sungho is just that amazing😍)Riwoo:
-Quality time (I feel like he'd love to spend his day with you and just have a lazy day together)Taesan:
-Quality time (Sometimes he struggles with his feelings so I feel like just being in your presence will help him feel better but he also appreciates a good hug)Leehan:
-Acts of service (This man always takes care of you and makes sure you're okay)Woonhak:
-Physical touch (I feel like he is very clingy and whenever he feels a strong emotion he hugs you)----------------------------------------------
They express their love with all the love languages but I feel like the ones listed above are more prominent for each member.P.S. I just got into boynextdoor so sorry if these don't seem entirely accurate :)