Both th are about 30+ FLs who are established office workers and good at heart. Both have families that don’t stress them to get married. Both have a one night stand with the intern working in their office as well as a second pursuer who older, rich and a CEO type. The FL are older but completely inexperienced in love. The second male leads take in the roles of love coaches as they learn how to love the tough their relationship with the intern.
BTD is a variant on the noona office romance where the FL scouts the ML and they work directly with each other as a team. Big difference is the in BTD, the FL is initially married and has a kid, in FY the FL is romantically inexperienced. But both dramas have competent FL who are genuinely nice people (although that isn’t immediately apparent in BTD, it becomes so midway)