Hello everyone so basically, I am looking for family friendly dramas ( because I really like to watch with my family ) like  365: Repeat the Year (2020) where drama revolves around one story not two or three or four different cases and there are more than 1 murders happening and literally everyone is suspect and  everyone starts doubting each other.  

Thank you for all your recommendations in advance

So regarding korean dramas i cannot think of many that would fit into this group
there is;
While you were sleeping - that follows the whole mystery/murder theme with future predictions and trying to change an outcome
Signal and Tunnel are also two dramas that deal around a group of people that try to change the future but neither is absolutely like 365 days

The two closes id recommend you are actually two cdramas;
Reset - in my opinion the one most similar to 365 days
and Missing Persons - a drama also revolving around a group of people that is intertwined with one another and facing a future/past dilemma 

Then there is also a very good taiwanese drama called Someday or One Day that has past and present connected and is quite complex to grasp. But very worth it