do you by any chance remember any other details?
fl are police and ml are... i forgot something about pyschology. and their first the case the victim and the killer have matches things. the killer said its because they are friends but they are not actually that close and its because the killer want to be popular (?) like the victim so she copy her. im sorry if its not that much
their first case***
hey !! i’m not really sure bc i haven’t read it myself, but this manhua seems to match your description !! - https://www.mangago.zone/read-manga/caution_love_around_the_corner/
fl have short have and ml have white hair. they were classmates/schoolmates. its a detective. their first case together are abt a girl killed by someone whos jealous of her. i read it on wecomics or webcomics