I like the concept that mc has twin, but i dont think its a good idea to give Ellen pov, because Ellen and Lai's apparance is so similar, so its really hard for us to know this is Ellen's pov or Lai's pov. Just enough with Lai's pov bcs he is the real mc in this story.
Or if the author want to give Ellen pov, at least make Ellen and Lai's apparance a little bit different so we can know who is who