Read this because a lot of people have commented on its similarity to 花千骨.
I don't think they're very similar though, in terms of writing style, pacing, characters, or plot. I guess only the overall theme is the same, but the feel of the book is quite different.
I preferred 重紫's writing style, but 花千骨 remains more memorable. Was it because I read it first? I don't know.
While 花千骨 is slow in the first half and picks up pace from the fourth vol onwards, 重紫 feels like the opposite. After 重紫 reincarnates and becomes 紫魔 and retreats to 九幽魔宫,the plot starts to slow. It becomes a repetition of 重紫 and 洛音凡 having a showdown-but-not-a-showdown, followed by 洛音凡 persuading her to follow him back to 南华 and accept her imprisonment/punishment, promising that he will help save her life.
Obviously 重紫 doesn't return, because his promises are not to be trusted.
He did kill her twice, after all.
So.
As for secondary characters, strangely enough, 闻灵之 was quite memorable. I think she was the only side character that actually matured as she grew older, and this was especially apparent when 司马妙元 was introduced in 重紫's second life, because of her likeness to 闻灵之 in her youth. I didn't really expect it, so I guess it was a pleasant surprise.
Other than the main characters, my favourite character was probably 万劫 (楚不复)... 死的太早太惨了。The part with 宫可然 also turned out to be less significant than I expected, in part because of how early (and permanently) he died. >.< Probably the saddest death in the novel.
Most conflicted character is definitely 天之邪(慕玉), 隐藏的太深太可怕. It's really funny if you think about it. 闵云中 spent the entire time wanting to 置重紫于死地 just because 她天生煞气,but he can't even see that his most favoured disciple 是魔不是仙,而且还是幕后的指使者。
I liked how the story doesn't deal in black or white though, where 仙人 doesn't automatically equate to good and 魔 doesn't necessarily mean evil. In fact, 重紫 with her 煞气 never truly harms another person, whereas the 'upright' 仙人 with their prejudice are the ones who pushed her to 入魔。
Interesting how the author chose to make 洛音凡入魔 in the end. I guess the story really goes into a full circle.