I can't shake this feeling that Eun Tak is connected to Kim Shin's past life when he was a general.…
Actually Sunny is the Queen that's why Grim Reaper (Wang Yeo) cried. Before his death, he was painting the Queen (Kim Sun). That shows he was regretting what he had done and that's why he became Grim Reaper after he died. Because he was too ashamed of his deeds. And the Queen (Kim Sun) is probably Kim Shin's little sister not his lover.
Sorry I read your comment so late :(