"men younger than friends than lovers" is "썸씽남"(ssŏm-ssing-nam) in Korean.
The 썸씽남 (Something nam), in the compound word of English as "썸씽 (something)" "남 (Man)", "Man of there is something going." That is a future likely to develop into a romantic relationship, likely there is edge of something male, meaning that. In the case of women 썸씽녀 and (Something nyeo) called.