let me just make it clear here about the who fell first and who fell harder troupe of renharem since i see people still did not get it right of exactly when it all starts:
markren: obv rj fell first but mk fell harder (rj first love + comfort person like the person he need when he's in doubt also his confidence lifter too and the person he trusts + always giving him courage. their busan story is exactly when mk has a different view of rj & open up to him slowly to the point where we get melted butter and soft pancakes couple 🥞 & parents of 5 children)
jenren: obv rj fell first and even harder too lol (for jnrn dynamics this is just my personal take from what i see since before until now in rj eyes jn is his cutest younger brother like puppy or his younger twins cause we already see so many examples when rj would be so protective, supportive, adoring jn so much especially when it comes to their birthday 23 but jn on the other hand have other vision of their dynamics aka old married couple what he said 😂 their different perspective is very fun to watch lol)
dongren: hc fell first and rj fell harder (donkatsu was the starting point then hc suddenly confess i like you in chinese during mfal era and rj was flabbergasted but still replied back i like you too 😂 then the rest was history like you can see how attentive hc is around rj and how giggly & enthusiastic he is when hc with him. rj eyes would always light up when he saw hc or talking about him during ot5 era 🥺 to me dongren is a definition of soulmate too)
jaemren: rj fell first jm fell harder (at the staircase during trainee days was their first met and rj said jm is handsome AND jm the only one that rj got a good first impression of unlike the rest which makes me think why he always soft & protective towards jm until now 🥺 relies on each other a lot & jm is also his energy booster+ confidence lifter. their dynamics is soo adorable and fluffy kind of feeling 🥺)
chenren: not so sure but i would say cl fell first and rj fell harder (rj has been taking care of cl since he first came into the team + both of their parents already met before + getting daegal together like she IS their daughter idc what others say. they are so married me think. cl is someone who protect & adored rj in a lowkey way + kind of a tsundere type too 🤭)
sungren: OBV js fell first and rj fell harder (rj is his first love. he already felt comfy with him even when they just met + rj already become js mini backpack since trainee days too 😂 + always babying each other + wanting to be the hyung of each other lol 🤣 + i hope rensung always keep living together in the same house 🙏🏻. even though js loves to tease rj but he truly care + love him with the same amount. rj is his important person. I always appreciate js so much whenever he would bring up ujumates to rj 🫶🏻 just like cl he is also the lowkey and tsundere type too on showing his adoration to rj. our renchin president!)

i can talk about their dynamics more but i ll just make it short here ✌🏻