Just wondering, does anyone knows any shows that are somewhat like this one?

Well, it's not fairytale themed, but there's an amazing 显示 called Lost, 由 the same makers of OUAT. There are flashbacks like OUAT, and there's a total of 6 seasons so you'll have plenty to watch! A couple characters from OUAT are in Lost, such as Belle, the giant from the episode Tiny, and Regina makes a small appearance in an episode. :) 迷失 is about a plane crash, and survivors land on an island. It's SUPER cool and extremely suspenseful. Watch it! :)