while this question can make me write an essay, I will try and keep my answer concise.
Understanding and quality time. That is what we can treasure from them. While we more often than not see the bickering moments and teasing moments, people often forget or look over the moments where they understand and spend time with each other the most. If there is something that beomgyu wants? hyung will buy it for him, going together to eat and shop has been their thing since before debuting. Even when in japan, they went out together to click pictures and just spend time. When beomgyu was nervous during the award show yeonjun did not hesitate to hold his hands and keep them warm. I think unsaid understanding is the most beautiful thing. Also if I can add it, that beomgyu said "come to me if you ever get tired, I will wait" because he is always there for him. It really is in the little things uk? they really just match so well together and UNDERSTAND each other so much. their bond is pretty beautiful too :( this got long and i had more to add but i think u get it? O-(-(