This one is my absolute favorite 
TITLE: To Be Human
GENRE: Mystery
AUTHOR: JennJam
DESC: When you fell in love with him, you quickly began to question everything. Your sanity, your life, and… your safety.
Number of episodes: 32 (fully released)
One of the hidden gems, it does contain romance but not the typical badboy-gangster-teacher love triangle stereotype. Definitely the best story I’ve ever read. **If you are easily triggered by violence and mature themes, might not be the best choice