I'm still confused about the window vs the roof! At the beginning it showed that the sister jumped from the roof but then later on it was from the office window. I don't know if I blinked & missed the explanation or simply zoned out but was that actually explained or was it just a continuity error? Because I don't remember that being explained. Could someone please clarify as it's bugging me. Thanks. 

But is it a continuity error or was there a deeper explanation? Since at first they showed her jumping from the roof but in the end everyone says she jumped from the office window. I don't remember it being explained but I'm wondering if I missed it.

I could be remembering wrong: but didn't they (the company) say she jumped from the roof? Like it was explicitly stated that's what the company said happened. She jumped from the roof.

It could have been part of the original story/plot to have it revealed "no she didn't jump from the roof from but she jumped out of Hwan-gi's office window" and then drag a few episodes with typical dramaland misunderstandings and finally finish with: "she actually jumped out of Hwan-gi's office because of *this*".

It went through major re-writes at the end of the 2nd(?) week and actually was off-air a full week because the drama was being received poorly. Perhaps they had a story in place but the changes destroyed that and created continuity errors like the one you are bringing up.

But it could also be a simple continuity error from the very start (re-writes or not) like you and others have said.

 Ocean:

Latecomer here. She jumped from the roof. She just left her shoes at the office window since the secretary knows that Hwan Gi always stand by the window. If you would notice, the girl jumping from the roof was barefoot and you cant see the shoes from the surroundings while climbing the edge (ep1). For me, there's no continuity error here.

I like this explanation but I don't believe it's true.  The guy says at one point,  "let's keep it between us that she jumped from here and tell people she jumped from the roof. " So I think it is a continuity error... but I really like Ocean's explanation so I may let this be what I decide to believe!!!