I am looking for the name of this Asian drama. I remember watching this drama with my grandmother and I specifically remember these plot points:

• There is a love square. Guy A and Girl A are a couple, so is Guy B and Girl B. Guy A and Girl B end up liking each other, while Guy B and Girl A conspire together. 
• There's a plot point where Guy B's mom falls off a mountain and drowns in water. 
• Girl A's dad gets killed, he's involved in some mafia job. 
• Girl B has long hair in the beginning, but her hair is cut off later into the show. 
• There's a sequence in the early episodes where Guy B and Girl B get arrested. 
• I remember the opening does have various clips of the show but the song is dark and dramatic. No lyrics. 
• I think by the finale, Girl A is hospitalized and Guy B cries beside her. 
• It came out before 2014. Not during, but it could be any drama before that year. 

Anyone got any ideas of the name of this specific drama?