
I'm pretty sure that the mastermind behind everything was Yoona, tho I don't know about her motive: is just simply make her man jealous or... ?
currently, the hints we have are:
Yoona route
1. Fake smile of Se-Ryeon, the golden retriever
2. Cunning smile of Yoona on that dinner
3. 'deliberately' lying to Se-Ryeon about Yoojin
Yoojin route
1. 'deliberate' notion of sending the retriever to Yoojin
2. How she left that kigurumi in Yoojin place
In my case the free coin zone was always:
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