who is Do Do Sol Sol La La Sol ?

 buchae:

the stalker. How else would he know her student was giving a performance?

Ok! lets say you are right, Who in their right mind would name their drama after a stalker? it just doesn't make sense to me.

first episode  Sun Woo Joon, dr cha , old men and stalker all of them were in same place and at the same time she got message ....but second episode we saw a men with suits was waiting for him while she was in hospital ....and episode 4 we saw the men was killed in the beach and had same watch as men was waiting for him in episode 3 ..... episode 9 stalker said you came here for me .... well its hard to tell