Can someone help me remember which bl this is

I cant remember the plot all i remember is that im pretty sure the main character has like kinda dark blondish hair and i think the male lead had dark hair. Im pretty sure the main character had this ex who has red hair. I think at some point of the story they said they knew each other as children i forgot why i think because he was living at his house (i could be wrong) and the male lead always had a crush on the main character but he was always hanging out with the red hair (his ex) when they were children its a fullcolor BL and if this rings a bell please tell me ╥﹏╥ also dont trust me with the hair colors cause i don't remember much. I think this BL also took place in a office setting as well