Except for this being an HS drama, and the poor twin being wrongly identified and so was able to have the life of the rich twin, this is nothing like School 2015.

In School 2015 Eunbi lost her memories and was wrongly identified as Eunbyol. She actually thought that the privileged life she returned to was hers. During this time, Eunbyol the rich twin, deliberately let Eunbi have her life. She did not lose her memories and was quietly investigating how to help Eunbi. This is really a case of mistaken identity. I liked it because it tackled the cause and effect of bullying.

Now in WWWY, Xia Er did not lose her memories, but because of money pretended to be Chu Yinyin. She accidentally picked up CYY's necklace and so was able to pretend. Meanwhile, CYY lost her memories and XE's friends wrongly identified her and took her home. To make the plot worse, XE saw CYY in her friend's Weibo live so she knew exactly where CYY was, she even visited her. She seemingly have a noble cause of investigating her sister's accident but this should have been handled by adults/police and not by teens who don't have any authority. In my opinion XE is just a swindler who wanted to experience her sister's Iife. She simply TOOK OVER and did not even feel guilty. The bullying shown in the drama was too superficial and its effect was glossed on over. Even after 15 episodes, I still couldn't relate to any of the characters and most acting were stiff, so I skipped to the last episode to see if there's any improvement but there's none. So please don't compare this to School 2015. Though I didn't like the end of the lovelines in School and the lovelines in WWWY had happier endings, School had a better plot, had more depth and had better acting.