SooReneccs

Police story
Mentor and student
Experiences versus modern police methods
Mentor has family and student is orphan
Investigating in a community, the small town which they live
Criminals are known to both policemen

sweet and romantic 1st love of main leads when they were both students. Here it also some age gap range but this here was only a couple of years. Also another similarity was the the male also tutored the younger female lead to get closer to her. The difference was in this drama they both lived in the same neighborhood whereas in Hidden Love , the male lead was the elder brother roommate and best friend.