Jade Heart of Pure White

(Not a traditional romance, not a revenge power fantasy, and the pacing is relatively slow.)

She was just an ordinary person from the new century, yet she somehow caught the latest trend and joined the great wave of people transmigrating to another world. But why does everyone else end up as an imperial princess or a rich young lady, or, at worst, a delicate country girl, while she’s transmigrated into a wronged wife hidden away in the inner chambers? Aaaah...