YES YES a thousand times yes okay so to me canon matt is a sub with all of hyung line. bin jyung neul tael all have mental leverage over him in one form or the other. With bin it's their natural hierarchy (i don't see hard dom sub for them but bin takes a firmer hand bc matt likes it), with jyung again its the age hierarchy plus the nature of their dynamic which relies on jyung being the caretaker, with neul and tael; they both have more mental leverage but it differs a lil. For tael he enjoys having leverage over matt and loves to one up him, neul is just such a dom its a foregone conclusion that he will dom matt (ahem def unpopular opinion but neul is the most dom in the jbw legal line). matt just seems the type to want to dom for the sake of their partner but then gets overwhelmed and reduced into a pile of mush in the end anyway and i just Love that flavour of smut for him. Hes so eager to please that he'd do anything but it won't change the fact that with the right pressure he'd be putty in [hyung line member's] hands hehe.

On super subby mattt hmmm ive considered a dynamic for him and bin where they do hard d/s stuff occasionally depending on ahem certain events (sung jealous we love you) and about the aftercare and post sex rituals that may come w it. I might explore this in a fic in the future just bc the idea is soooo delicious hehe