The name of this flawless dungeon princess is Zhang Liyin. She's a SM Entertainment soloist. You'll recognize her from her epic music videos (that actually feature a story line). Too bad her most famous song, "Timeless" got banned by SM.
Alternate version of "Moving On" fancam here.
Sources: Videos: Rikawendy, Daydreamer11587; Photos: Baidu
It's been four years since she last released a new song. I hope this new singing style of hers means she's finally going to get a comeback because apparently she's been working under a new vocal trainer all year.