Yeah like That! The know each other since hight school, The were first lovers and had been making out since then, They love each, but Black hair guy always wanted something more serious, but Red hair doesn't rely on him, He doesnt want nothing serious or doesnt know how tô have That. So sunbae, even tho he loves him, he got tired and The blond guy showed up, with some non-toxic relationship but black hair cant embrace it cuz he still its not totally over red hair guy, so he basically does the same with him and dont rely on him (but they had this situation clear from the start, blonde went for it anyway)....