Is Yi-Soo alive?!!

Who/where/how is Yi-Soo? In a roundabout way everyone is now thinking of YS. He has very cleverly set everyone's mind ticking and wondering. JHW is now wary of YS after that kiss and she tries to keep a distance.
The story moves to Okinawa where YS lives. There is another parcel which leads JHW to a picture of a place which is not too far from Okinawa. Upon her visit KHW finds out that YS was bought to the house after his accident. She is shown the 'circle' and given the shark pendant as proof of his stay & the fact that he was alive. Clearly she is heartbroken and the episode ends with this sobering realization.
As for YS, his emotions are on full display when he talks/sees his sister. This is brilliantly done as the focus is so much on revenge that it is easy to forget what him and his family have had to endure.

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