I think sangwoo is that yellow haired angel he wanted to (expireance?)love so he come down...

I think sangwoo is that yellow haired angel he wanted to (expireance?)love so he come down to the earth and maybe dana lost her wings bcs she was looking for that yellow haired guy but one day when she was losing hope to get back to heaven sangwoon appeared she doesnt know the yellow haired angel is him now she is sucking his life force to get at the yellow haired angel