Older woman/younger man relationship between a working woman and a student. HKWS is much more of a taboo relationship since the boy in not only in high school, but is actually her student at cram school, but the FL acknowledges keeps her distance (or tries to), so it feels cute rather than creepy like some other teacher/student series.
FL and ML don't work together, but they attend the same adult violin class at a local community center. Obviously, they get off on the wrong foot. ML is younger and tsundere and FL is a jilted, former office lady looking for a reset. They butt heads, and it's fun watching their relationship develop as they face their own personal challenges and try to understand each other.